Water Source™ PCV150 Plastic Spring Loaded Check Valve, 1-1/2"The 1 1 2 inch plastic check valve keeps prime in jet, submersible, and centrifugal pumps. When a pump shuts off, the check valve closes preventing the water from traveling back to the source. This check valve is constructed of heavy brass material. 1 1 2" Keeps prime in jet, submersible, and centrifugal pumps Constructed of heavy brass material Prevents back flow to the pump Vertical or horizontal application Rated at 150 PSI. WARNING: Cancer and