(1)*** ONE *** 2" Black Duckbill valve for M-Pump. PLEASE NOTE: YOU NEED 2 SETS OF TWO VALVES, TOTALLING 4 RED NITRILE VALVES TO REBUILD THE PUMP.

We also recommend that when you replace your duckbill valves, you should replace the diaphragm, (Part # 600342419).

Please see the M-Pump maintenance kit, part # 310531, which includes 4 black duckbill valves and the diaphragm.