Replacement duckbill check valve inserts (MCCVDB0) for Stenner injection check valves on 45, 85, 100, and 170 Series pumps, plus SVP and BDF Series; 5 per pack. They restore one-way flow at the injection point to prevent backflow and siphoning. Made of Santoprene and supplied as genuine OEM parts; install inside the injection check valve body.








