Toro 53740 1/2-Inch Sprinkler System Automatic Drain Valve
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There would need to be a minimum amount of 15 lbs of pressure to stop this from leaking. Henry, take care and take care of yourself
I used landscape fabric to cover mine instead of burying it because of problems with an older design where dirt seeped in. I didn't want to risk it this time since I had problems with a different and older design where dirt seeped in.