CRAFTSMAN Sump Pump Check Valves are built with top level quality and the pride you expect with the long standing reputation of CRAFTSMAN.. This heavy-duty full-flow, sump pump check valve will dependably pass water as it discharges, but will prevent any backflow into the basin creating a cycling condition on the pump which leads to shorter lifespan. CRAFTSMAN Sump Pump Check Valves are built with a robust ABS housing coupled with slip fit rubber boot connectors for a speedy installation.