Sprinkler Heads Seeping on Zone 1: Valve Diaphragm Replacement

Low-Head Drainage vs. Weeping Valve: How to Tell

If Zone 1 heads seep continuously—even hours after system off—and replacing heads + Teflon tape didn't help, the Zone 1 control valve diaphragm is leaking.

Why It's the Valve, Not the Heads

• Seeping stops when irrigation main shutoff is closed.
• Seeping stops when controller is turned OFF (power removed from valve).
• Both confirm water is passing through the valve when it should be closed.

Repair Steps

1. Locate Zone 1 valve (usually in green box near other valves). 2. Shut off irrigation main. 3. Remove valve bonnet (top), pull out rubber diaphragm. 4. Take diaphragm to irrigation store for exact match (brand + model). 5. Install new diaphragm, reassemble, test.

Pro Tip

While valve is open, flush the line: briefly turn on water to blow out debris that caused the leak.