Unscrew the old head, screw on the new one, and test the spray pattern

Replacing a Hunter sprinkler head takes about five minutes and requires no tools beyond your hands. Turn off the water at the main valve or zone valve, unscrew the damaged head counterclockwise by hand, and screw the new head clockwise until it is snug—do not overtighten. Turn the water back on and check that water sprays in the correct pattern and distance. If the new head does not match the old one's spray radius or nozzle type, the coverage in that zone will change.

The most common reason to replace a head is that it has cracked, stopped rotating, or sprays water in the wrong direction. Mineral buildup inside the nozzle can also block flow, but that usually calls for cleaning rather than replacement. Before you buy a new head, note the model number of your existing sprinkler (usually stamped on the top) and whether it is a rotor, spray head, or pop-up, because Hunter makes different types for different coverage areas.

Key Takeaways

  • Turn off water at the zone valve or main valve before you unscrew anything, or water will spray out and you will waste time mopping.
  • Unscrew the old head by hand—it threads into the riser pipe, and you do not need a wrench or pliers.
  • Buy a replacement head that matches the spray type (rotor, spray, or pop-up) and nozzle size of the old one, or coverage will be uneven.
  • Screw the new head on by hand until snug, then turn water back on and watch the spray pattern before you bury the line again.

Turn off the water before you start

Locate the zone valve that controls the sprinkler line you are working on. Most residential systems have a valve box in the yard—usually a green or gray plastic box sunk into the ground—with multiple valves inside, one per zone. Turn the handle on the correct valve clockwise until it stops. If you cannot find the zone valve or are not sure which one controls that sprinkler, turn off the main water valve instead, which is usually near the meter or where the water line enters the house.

Once the valve is off, turn on a faucet or sprinkler downstream to release any pressure still in the line. This step prevents water from spraying in your face when you unscrew the head. Wait a few seconds for the line to empty, then you are ready to work.

Unscrew the old sprinkler head by hand

Grip the body of the sprinkler head—the part that sticks up from the ground—and turn it counterclockwise. The head threads onto a riser pipe below ground, and hand pressure is usually enough to loosen it. If the head is stuck from mineral deposits or corrosion, wrap a cloth around it for better grip, or soak the joint with penetrating oil and wait 10 minutes before trying again. Do not use a wrench or pliers on the head itself, because you can crack the plastic body.

Once the head is loose, unscrew it the rest of the way by hand and set it aside. You may see a small amount of water or mud in the riser pipe—that is normal. If water is still flowing, the zone valve did not close all the way; go back and turn it further clockwise.

Identify the type and size of the replacement head

Look at the old head and note what kind it is. Spray heads are short and stationary, spraying water in a fixed arc (usually 90, 180, or 360 degrees). RotorsPop-ups

Next, check the nozzle size. Most Hunter heads are marked with a number on top—common sizes are 4, 6, 8, 12, or 15, which refer to the spray radius in feet. If the old head is marked "8," buy a replacement marked "8." If the marking is worn off, measure how far the old head sprayed water when it was working, or ask the person who installed the system. Buying the wrong nozzle size is the most common mistake; a head that sprays 4 feet will leave dry patches if the zone was designed for 8 feet.

Screw on the new head and test the spray

Take the new Hunter head and thread it clockwise onto the riser pipe by hand. Screw it down until it is snug and does not wiggle, but do not force it—you are tightening a plastic fitting, not a car wheel. The head should sit at the same height as the old one did; if it is too high or too low, you may have the wrong model.

Turn the zone valve back on and watch the new head spray. The water should come out in the same pattern and distance as before. If the spray is weak, the nozzle may be clogged; turn the water off, unscrew the head again, and rinse the nozzle under a faucet. If the spray is too short or too long, you installed the wrong nozzle size and will need to replace it again. Once the spray looks correct, turn off the water and you are done.

Common mistakes that waste time

The most frequent error is forgetting to turn off the water first. When you unscrew a live head, water shoots out under pressure and soaks your shoes and the surrounding soil. Always shut off the zone valve before you touch anything.

The second mistake is buying a rotor when the old head was a spray head, or vice versa. These are not interchangeable—a rotor needs more water pressure and covers a larger area, so installing one in a spray-head zone will either not work or will water the wrong part of the lawn. Check the old head before you go to the store.

The third mistake is overtightening the new head. Plastic threads strip easily, and if you cross-thread the fitting, you will have to dig up the riser pipe and replace it—a much bigger job. Hand-tight is enough; if water leaks from the joint when you turn the system on, turn it off and tighten a quarter turn more.

When to call a professional instead

If the riser pipe itself is cracked or leaking, or if you cannot unscrew the old head even after soaking it with penetrating oil, the problem is below ground and you will need a sprinkler technician. The same applies if the new head does not fit the riser pipe—this usually means the riser is damaged or the wrong size, and digging it out is beyond a quick replacement.

If multiple heads in the same zone are broken, or if the zone does not hold pressure when you turn it on, the problem is likely in the valve or the main line, not the heads. A technician can diagnose this faster than trial and error.

Frequently Asked Questions

What if water leaks from the connection after I screw on the new head?

Turn off the water, unscrew the head a quarter turn counterclockwise to loosen it, then screw it back on slowly and stop as soon as you feel resistance. Tighten it one more quarter turn. If it still leaks, the threads may be damaged; unscrew it completely and inspect the riser pipe for cracks or debris, then try again with the new head.

Can I replace a Hunter head with a head from a different brand?

Not reliably. Different brands use different thread sizes and connection types. A Rainbird or Toro head may not fit a Hunter riser, or may fit but not seal properly. Stick with Hunter heads for Hunter risers to avoid leaks and coverage problems.

Do I need to adjust anything after I install the new head?

Most Hunter heads come preset to spray 360 degrees (full circle). If you need a different pattern—90, 180, or 270 degrees—you can adjust the arc by turning a screw on top of the head with a screwdriver. Check the instruction sheet that came with the new head for the exact adjustment method, as it varies by model.

How do I know if the new head is the right nozzle size?

Turn on the zone and watch where the water lands. If it reaches the same distance as the old head did, the size is correct. If it falls short or sprays too far, turn off the water and replace the nozzle. You can also measure the old head's spray radius with a tape measure while the system is running, then match that distance with the new head.

What if the new head does not pop up or rotate?

Check that the zone valve is fully open—turn the handle counterclockwise until it stops. If water still does not flow, the nozzle may be clogged; unscrew the head and rinse the nozzle under a faucet. If the head is a rotor and the nozzle is clean but the rotor does not spin, the internal turbine may be broken and you will need a new head.