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There was a whoosh of air as the spring-loaded gate valve opened.

At that point, the gate valve opened and the pod entered the tube, ready for the test.

On the other hand, sometimes you’ll find a large gate valve that exposes a 4-1/2″, 5″, or 6″ threaded connection hanging off of the big intake.

The sludge drain, which opens into the bottom of the tank, is usually a 4- or 6-inch cast-iron pipe, with suitable gate valve, which discharges into a common drain made of clay pipe.

After long labor engineers succeeded in clamping a master gate valve on the well, only to see the connections ripped apart, tossed into the air.