About This Item 【Package Contents】Includes Two 385310076 Rubber Duckbill Check Valves compatible for vacuum generators, and the size of the product is 1 3/4 "L x 1 5/8" Dia. 【Replacement Part NO. 】 Duckbill Valve Kit fit for S and T series pumps. Compatible with models: S12D, S12DAB, S24D, S32D, S115A, S12, 52A, S32, T12, T24, T32, VG12, VG24 and VHT. 【Function】This 385310076 Duckbill Valve Kit provides a tight seal prevent backflow maintenance-free. .