Originally Posted by lpdjshaw
These are fine with a gravity system but only 3/8" outlet so not so great if you're using a pump.
They're 1/2" outlet and 1/2" inlet. The inlet is 3/8" threaded inside the inlet. So they'll take a male 3/8" on the inside. The flow is all 1/2" OD though. I use them with Chugger pumps. Same flow as any other 1/2" valve I use...