1/2 lb spring "magically" eliminates water hammer|Reduces motor and pump noise from plumbing system|Designed for both horizontal and vertical usage|Full-flow, non-clog design installation|Durably-constructed PVC check body and compression end fittings|Solvent-weld ends with unions allow for easy installation|No threading of pipe required|Consult factory if use over 130 deg F (54 deg C) required|Suitable for installation basin cover|Quiet checks with quarter turn ball valves|White color|16 in length