Replacement Diaphragm for DIG Valves (3/4" and 1")

A quick guide to rebuilding your valve and restoring a leak-free seal.

Step 1: Turn Off the Water
Before attempting any valve maintenance, ensure the main water supply to your irrigation manifold is completely turned off and the line is depressurized.

Step 2: Remove the Valve Bonnet
Using a screwdriver or wrench, carefully remove the bolts or unthread the cap holding the top of the valve (the bonnet) in place. Lift the bonnet slowly, being careful not to lose the internal spring.

Step 3: Swap the Diaphragm
Remove the torn or degraded old diaphragm. Wipe the inside seating area of the valve body with a clean, damp cloth to remove any sand or grit. Place the new diaphragm inside, ensuring any alignment holes perfectly match the valve body.

Step 4: Reassemble and Test
Place the internal spring back into position and secure the bonnet over the top. Tighten the bolts evenly in a cross pattern. Turn the main water supply back on and check the valve to ensure it opens and closes without leaking.

As I start my system this spring, how do I know if I need a new Replacement Diaphragm for my 3/4" or 1" DIG valves?
If your valve continuously weeps water or fails to shut off completely when the spring watering cycle ends, you likely need a new Replacement Diaphragm. This usually means the old rubber tore during a winter freeze.

Spring startup is the most common time to discover valve damage. Replacing the internal diaphragm is much faster and cheaper than cutting out the entire valve and replumbing the manifold.

Will this Replacement Diaphragm fit new DIG AC valves?
No, this Replacement Diaphragm is designed exclusively for older, discontinued 3/4" and 1" DIG automated valves, specifically the 2-wire (9V) and 3-wire (18V) DC latching models.

Modern DIG valves and AC valves use different internal components. Please verify that you have the older discontinued models before purchasing to ensure compatibility.

Does the Replacement Diaphragm for DIG Valves come with the internal spring?
No, the Replacement Diaphragm for DIG Valves includes only the rubber diaphragm itself. You must reuse the original spring from your existing valve.

Be very careful when removing the bonnet of your valve to access the old diaphragm, as the internal spring can easily pop out and get lost in the dirt.

How do I clean the valve before installing the Replacement Diaphragm for DIG Valves?
Before installing the Replacement Diaphragm for DIG Valves, wipe the inside of the valve body with a clean, damp cloth to remove any sand, grit, or mineral buildup.

Even a single grain of sand trapped under the new rubber diaphragm can prevent it from sealing completely, causing the valve to continue weeping even with a brand new part.