Sweetwater Regenerative Blower Inlet Check Valve Assembly For S41 Blower (Plastic)Inlet check valves can be plastic, but outlet check valves are subject to high temperatures, requiring steelInlet Check Valve Assembly (Plastic) for S41 Sweetwater Regenerative BlowerInlet check valves can be plastic, but outlet check valves are subject to high temperatures, requiring steelProduct code: 5792Item No. AE-SW-BCVA3