Fitting Type: VALVE Material: PVC Assembled Product Length: N/A Assembled Product Height: N/A Assembled Product Width: N/A . For use with any type of well pump or irrigation system Prevents backflow and maintains system pressure Easy to install Stainless steel spring and fasteners Tapered seat Spring-loaded poppet and o-ring assures reliable operation Rubber seating gasket ensures positive seal Can be installed in both vertical and horizontal position