Campbell ABS Plastic Blue 1-1/4 in. Watertight Well Cap

These well caps fit on top of the water well casing in systems that use a pitiless adapter, which is a device that is attached below ground to the well casing. The adapter provides a sanitary and frost proof seal between the casing and the waterline that runs out from the casing to a building. Well caps prevent surface liquids and debris from entering the well and contaminating the water supply.