This Everflow Buterfly-Style Check Valve is the ideal choice for protecting your pipelines from reverse water flow. It features a heavy duty rust resistant cast brass construction, brass hinged disc, secure connections, and multiple approvals. Manufactured with the highest quality materials and workmanship, it will serve your plumbing needs WARNING:Handling of this product will expose you to lead, a chemical known to the State of California to cause [cancer, and] birth defects or other reproductive harm.Wash hands after handling.