Product Description The Basement Watchdog Klunkless Check Valve has a large silencing air chamber that absorbs the downward force of the water after the pump stops, diminishing the loud clunk when the flapper closes. Now, you won’t be awakened on rainy nights by a clunking noise every time the sump pump stops. From the Manufacturer Eliminates the irritating -"clunk"-Inch when sump pumps turn off. Patented silencing air chamber absorbs the shock. Easily installed on both 1-1/4-Inch and 1-1/2-Inch pipes. Includes stainless steel hose clamps.
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