How to Replace Hunter I20 Sprinkler Head? Quick Guide

Introduction

Your irrigation system is only as strong as its weakest component, and a damaged or malfunctioning sprinkler head can waste hundreds of gallons of water every week. If you own a Hunter I20 rotor, you already know it is one of the most popular and reliable sprinkler heads on the market. However, even the best equipment eventually wears out and needs replacement. Whether your current head is cracked, leaking from the base, spraying unevenly, or simply stuck in the up position, learning how to replace Hunter I20 sprinkler head is a skill that every homeowner with an irrigation system should have in their toolkit.

This guide walks you through the entire process from start to finish. You will learn how to identify the signs that your sprinkler head needs replacing, gather the right tools, remove the old unit safely, install the new one correctly, and test everything to make sure it works properly. We will also cover common mistakes to avoid, practical tips for extending the life of your sprinkler system, and a comparison of the Hunter I20 against other popular sprinkler models. By the end of this article, you will feel confident tackling this project on your own and saving the cost of a professional service call.

Table of Contents

• What Is the Hunter I20 Sprinkler Head?
• Signs You Need to Replace Your Hunter I20 Sprinkler Head
• Tools and Materials You Will Need
• Safety Precautions Before You Begin
• Step-by-Step Guide to Replace Hunter I20 Sprinkler Head
• How to Remove the Old Sprinkler Head
• Installing the New Hunter I20 Sprinkler Head
• Adjusting and Testing Your New Sprinkler Head
• Comparison Table: Hunter I20 vs. Other Sprinkler Heads
• Tips and Best Practices
• Common Mistakes When Replacing a Sprinkler Head
• Frequently Asked Questions
• Conclusion

What Is the Hunter I20 Sprinkler Head?

The Hunter I20 is a gear-driven rotor sprinkler head designed for medium to large turf areas. It is widely used in residential and commercial irrigation systems because of its reliable performance, adjustable arc settings, and durable construction. The I20 rotates at a steady pace and can cover a radius of up to 35 feet depending on the nozzle installed, making it suitable for lawns, parks, sports fields, and commercial landscapes.

One of the reasons the Hunter I20 has remained a favorite among installers and homeowners alike is its simplicity. The internal gear mechanism is sealed and protected from debris, which reduces the chance of mechanical failure. The nozzle turret can be removed and cleaned easily, and the head can be adjusted for arc and distance without special tools. However, like any mechanical device exposed to weather, soil, and constant water pressure, the I20 will eventually need maintenance or full replacement.

Signs You Need to Replace Your Hunter I20 Sprinkler Head

Not every issue with a sprinkler head requires a full replacement. In many cases, a quick cleaning or a minor adjustment will restore proper function. But there are clear warning signs that tell you it is time to replace the unit entirely.

• Cracks or visible damage: If the plastic housing is cracked, split, or shattered, water will leak from the body of the head. Cracks usually result from freeze-thaw cycles, physical impact from mowers, or simple aging.
• Constant leaking from the base: Water seeping up from around the base of the sprinkler even when the system is off often indicates a failed seal or a damaged spring mechanism.
• Sprinkler stuck in the up position: If the head refuses to retract into the ground after the cycle ends, the return spring may be broken or the gear mechanism may be jammed beyond repair.
• Uneven or weak spray: When the sprinkler rotates but distributes water unevenly, it could be a nozzle issue. However, if cleaning the nozzle and replacing the filter does not fix the problem, the internal gears may be worn out.
• Excessive water pooling: Puddles forming around the sprinkler head during operation can signal a problem with the seals or the body threading.
• Age: Most Hunter I20 heads last between 8 and 15 years depending on water quality and climate conditions. If yours is approaching or exceeding that range, preventive replacement is a smart move.

Tools and Materials You Will Need

Gathering everything before you start will save you from frustrating mid-project trips to the hardware store. Here is a complete list of what you need to successfully replace a Hunter I20 sprinkler head.

Required Tools

• Flat-head screwdriver or sprinkler head removal tool
• Adjustable wrench or pliers
• PVC pipe cutter or hacksaw (if the riser needs trimming)
• Teflon tape (PTFE thread seal tape)
• Pipe thread sealant or pipe dope
• Level
• Marker or pencil
• Safety glasses and work gloves

Required Materials

• Replacement Hunter I20 sprinkler head (or compatible model)
• PVC primer and cement (if you are working with PVC piping)
• Replacement riser or adapter (if needed)

Safety Precautions Before You Begin

Replacing a sprinkler head is generally a straightforward DIY project, but safety should always come first. Before you dig or disassemble anything, take the following precautions.

• Turn off the water supply: Locate the irrigation controller and set it to the off position. Then, shut off the water supply at the main valve to prevent pressurized water from spraying at you when you remove the old head.
• Call 811 before digging: If your sprinkler head is connected to a buried water line, contact your local utility locating service to mark underground pipes, cables, and gas lines before you dig.
• Wear protective gear: Safety glasses protect your eyes from soil and debris when removing the old head. Work gloves shield your hands from sharp edges on PVC and metal fittings.
• Let the system depressurize: After turning off the water, open a nearby valve or run a hose to drain remaining pressure from the line.

Step-by-Step Guide to Replace Hunter I20 Sprinkler Head

Now that you are prepared, here is the complete process for how to replace Hunter I20 sprinkler head from start to finish.

1. Locate and mark the sprinkler head: Walk the area and identify the exact location of the damaged head. Use a marker or flag to note the spot. If the head is completely buried, look for a small bump in the turf or trace the water line from the controller valve.
2. Turn off the water and depressurize the line: Switch the irrigation controller to off and close the main valve. Open the nearest sprinkler or hose bib to release any remaining water pressure in the pipe.
3. Dig around the sprinkler body: Using a shovel or hand trowel, carefully excavate the soil around the sprinkler head. Dig at least 6 to 8 inches away from the head to avoid hitting the body or riser with your tool. Remove the soil and set it aside.
4. Remove the old sprinkler head: Grip the top of the sprinkler body with an adjustable wrench or use a sprinkler removal tool. Turn the body counterclockwise to unscrew it from the riser or pipe fitting. If it is stuck, apply penetrating oil and let it sit for 10 to 15 minutes before trying again.
5. Inspect the riser and pipe: Once the old head is removed, inspect the riser and the pipe connection for damage. Look for cracks, corrosion, or thread damage. Repair any issues before installing the new head.
6. Clean the threads: Remove any old Teflon tape, pipe dope, or debris from the male threads on the riser. Use a rag or wire brush to clean the threads thoroughly.
7. Install the new Hunter I20 sprinkler head: Wrap the riser threads with new Teflon tape, winding it clockwise around the threads. Apply a thin coat of pipe thread sealant if desired. Thread the new sprinkler body onto the riser by hand first, then tighten it snugly with a wrench. Do not overtighten, as this can crack the PVC or damage the threads.
8. Backfill the area: Carefully fill the hole with the soil you removed, gently packing it around the sprinkler body. Avoid pressing too hard against the head, which could shift or damage the installation.
9. Turn the water back on and test: Open the main valve, set the controller to run, and check the new sprinkler head for proper operation. Look for leaks at the connection point and verify that the head pops up, rotates smoothly, and sprays evenly.
10. Adjust the arc and radius: Use the adjustment screws on top of the Hunter I20 to set the spray arc and distance to match your landscape needs.

How to Remove the Old Sprinkler Head

Removing the old Hunter I20 is often the trickiest part of the entire project, especially if the head has been in the ground for many years. Soil buildup, mineral deposits, and corrosion can fuse the threads together over time. Here are some additional tips to make removal easier.

Start by excavating the soil down to the top of the sprinkler body. Use a flat-head screwdriver to pry up any grass or sod around the perimeter. Once you have clear access, look for a small notch or flat on the top of the sprinkler turret. This is where you can insert a screwdriver or a dedicated sprinkler removal tool for better leverage.

If the body will not budge, try pouring a small amount of penetrating oil around the base where the body meets the riser. Let it soak for at least 10 minutes. You can also gently tap around the fitting with a rubber mallet to help break the bond. Never use excessive force with a metal wrench directly on the plastic body, as this will crack it and make the removal even harder. If the riser itself is damaged, you may need to cut it off with a PVC cutter and install a new riser along with the new head. (See Also:How To Drain Residential Fire Sprinkler System)

Installing the New Hunter I20 Sprinkler Head

With the old head removed and the area prepped, you are ready to install the replacement. Proper installation ensures a leak-free connection and long-lasting performance.

Begin by wrapping the male threads on the riser with Teflon tape. Hold the tape at the base of the threads and wind it clockwise as you move upward. Use three to five wraps, which is enough to create a good seal without creating bulk that makes threading difficult. If you prefer an even stronger seal, apply a thin layer of pipe thread sealant over the tape.

Next, thread the new Hunter I20 sprinkler body onto the riser by hand. Turn it clockwise until it is hand-tight. Then, use an adjustable wrench to snug it down approximately a quarter to a half turn. The key here is to tighten enough to prevent leaks without cracking the PVC riser or stripping the threads. If you hear a creaking or cracking sound, stop immediately and back the head off slightly.

Make sure the sprinkler body is oriented correctly. The arc adjustment screw should be accessible on top, and the nozzle turret should face the direction you want the water to spray. Once the head is secured, you can move on to testing and adjustment.

Adjusting and Testing Your New Sprinkler Head

After installation, testing is essential to confirm everything works correctly. Turn the water supply back on and set your irrigation controller to run the zone where the new head is installed.

Watch the head as it pops up. It should rise to its full height and begin rotating smoothly. If the head does not pop up fully, check for obstructions in the nozzle or adjust the height screw on the top of the body. The height screw controls how far the riser extends, and it can be turned clockwise to raise the head or counterclockwise to lower it.

Next, adjust the spray arc using the arc adjustment screw on top of the turret. Turn the screw to increase or decrease the rotation range. Most Hunter I20 models allow you to adjust the arc anywhere from 40 to 360 degrees. Use a flat-head screwdriver and make small adjustments, checking the spray pattern after each change.

Finally, check the connection point at the base of the sprinkler for any signs of leakage. If water is seeping from the threads, turn off the water, remove the head, add more Teflon tape or sealant, and reinstall it. Let the system run for at least five minutes to confirm a solid, leak-free connection.

Comparison Table: Hunter I20 vs. Other Sprinkler Heads

Understanding how the Hunter I20 compares to other popular sprinkler heads can help you decide whether to replace with the same model or consider an alternative. (See Also:How Much Is Fire Sprinkler System)

As the table shows, the Hunter I20 is designed for larger coverage areas and offers a wider flow range than many residential alternatives. If your current system uses the I20, replacing it with the same model ensures compatibility and consistent performance across your irrigation zones.

Tips and Best Practices

These recommendations will help you get the most out of your replacement and keep your irrigation system running smoothly for years.

• Replace in pairs or groups: If one Hunter I20 head has failed due to age, others in the same zone are likely close to the end of their lifespan too. Replacing them together saves time and ensures even water distribution.
• Use manufacturer-approved nozzles: After installing the new head, verify that the nozzle is designed for the Hunter I20. Third-party nozzles may fit physically but can alter flow rates and spray patterns in unexpected ways.
• Flush the system before installing: When removing the old head, turn on the water briefly to flush out any dirt, sand, or debris from the pipe. Foreign particles can damage the internal gears of your new head if they are pushed into it during installation.
• Check water pressure: Excessively high water pressure can shorten the life of any sprinkler head. If your system pressure exceeds 60 PSI, consider installing a pressure regulator at the zone valve.
• Mark sprinkler locations: After installation, place a small flag or marker near the sprinkler head. This prevents accidental damage from shovels, mowers, and other garden equipment.
• Perform seasonal inspections: Walk through your irrigation system at least twice a year, in spring and fall, to check for leaks, clogged nozzles, and damaged heads. Early detection prevents small problems from becoming expensive repairs.

Common Mistakes When Replacing a Sprinkler Head

Even straightforward projects have pitfalls. Here are the most common mistakes homeowners make when attempting to replace a Hunter I20 sprinkler head, along with practical solutions.

• Overtightening the connection: Screwing the new head down too hard can crack the PVC riser or strip the threads. Always hand-tighten first, then use a wrench for only a quarter turn beyond snug.
• Skipping the Teflon tape: Some people assume the threads will seal on their own. Teflon tape is essential for creating a watertight seal and preventing leaks at the connection.
• Failing to depressurize the line: Opening the new head while water is still pressurized in the pipe can cause a sudden burst of water, potentially injuring you or flooding the area.
• Ignoring riser height: If the riser is too short or too long, the sprinkler may not pop up correctly or may sit too high above the turf. Always verify the riser length before installing the new head.
• Choosing the wrong replacement model: Not all sprinkler heads are interchangeable. Always confirm that the replacement is compatible with your existing pipe size, threading, and system pressure before purchasing.
• Not testing after installation: Installing the head and walking away without testing is a recipe for undetected leaks and poor spray patterns. Always run the system and inspect the area carefully after replacement.

Frequently Asked Questions

How to Replace Hunter I20 Sprinkler Head?

To replace a Hunter I20 sprinkler head, first turn off the water supply and depressurize the irrigation line. Dig around the old head, unscrew it counterclockwise from the riser, and clean the threads. Wrap the riser with Teflon tape, thread on the new Hunter I20 by hand, then snug it with a wrench. Backfill the area, turn the water back on, and test for proper operation and leaks.

What Tools Do I Need to Replace a Hunter I20 Sprinkler Head?

You will need a flat-head screwdriver or sprinkler removal tool, an adjustable wrench, Teflon tape, pipe thread sealant, a shovel or trowel, safety glasses, and work gloves. If the riser is damaged, you may also need a PVC cutter, PVC primer, cement, and a replacement riser.

How Long Does It Take to Replace a Hunter I20 Sprinkler Head?

For someone with basic DIY experience, replacing a single Hunter I20 sprinkler head typically takes between 30 minutes and one hour. If you are replacing multiple heads in the same zone, plan for two to three hours depending on soil conditions and accessibility.

Can I Replace My Hunter I20 With a Different Sprinkler Model?

Yes, but compatibility is important. The replacement must match the pipe size, threading type, and flow rate of your system. If you switch from a gear-driven rotor like the Hunter I20 to a fixed spray head, you may also need to adjust the nozzle layout and irrigation zone programming to achieve proper coverage. (See Also:How Often Should You Move Your Sprinkler)

Why Does My Hunter I20 Sprinkler Head Get Stuck in the Up Position?

The most common causes are a broken return spring, debris trapped in the gear mechanism, or mineral buildup inside the body. In many cases, removing the turret and cleaning the internal components resolves the issue. If the spring is broken or the gears are damaged, full replacement is the most reliable fix.

My New Sprinkler Head Is Leaking at the Base. What Should I Do?

A leak at the base usually means the threads were not sealed properly. Turn off the water, remove the head, rewrap the riser with fresh Teflon tape, apply pipe thread sealant, and reinstall the head. If the leak persists, check the riser and pipe for cracks, as damage to these components can also cause water to seep from the connection.

Conclusion

Knowing how to replace Hunter I20 sprinkler head is a valuable skill that saves money, reduces water waste, and keeps your lawn looking its best. The process is manageable for most homeowners with basic tools and a little patience. By following the steps outlined in this guide, you can confidently remove the old unit, install a new one, and verify that it operates correctly. Remember to turn off the water before starting, use Teflon tape on every threaded connection, avoid overtightening, and always test the system after installation. If you run into issues beyond a simple seal repair, do not hesitate to consult a licensed irrigation professional. With proper care and timely replacement of worn components, your Hunter I20 sprinkler system will deliver reliable performance for many seasons to come.