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The 1-1/2" waste valve assembly (VALT1001B) is a component used in RVs and similar applications to control the discharge of wastewater. It is designed to fit a 1-1/2" hub and is used to connect the RV's gray-water tank to the sewer hose. The valve allows the wastewater to flow out when open and prevents it from leaking when closed. This specific waste valve assembly is a common replacement part for RVs and is readily available for purchase from various retailers.