🔒 Secure Your Sump, Silence the Clunk! Airtight chamber ensures water stays where it belongs—out of your sump pit. No glue? No problem! Install on 1-1/2” or 1-1/4” pipes in a snap. Experience a peaceful sump pump operation with our innovative silencing air chamber. Enjoy a 2-year warranty for worry-free operation. Durable stainless-steel hose clamps included for a secure fit. Airtight design Silencing air chamber Easy installation The Basement Watchdog Model KCV1 is a klunkless sump pump check valve designed for easy installation on 1-1/2” and 1-1/4” pipes. Its silencing air chamber minimizes noise, while the airtight design prevents water re-entry into the sump pit. Made with durable stainless steel components, it comes with a 2-year warranty for added assurance.