High Performance: These check valves are professionally designed to prevent backflow in vacuum and discharge pumps, helping to maintain and generate vacuum. They should be replaced frequently for optimal performance. Technical Details: This Dometic Sealand Duck Bill Valve Kit includes two 1-1/2" duckbill valves for T and S series pumps. These valves are a critical component of the VacuFlush system, designed to prevent reverse flow in vacuum and discharge pumps. S series vacuum pumps, low profile vacuum pumps, and VG2 vacuum pumps require 4 valves (2 kits). The T series discharge pump requires 1 kit (2 valves). Durable Construction: Made from premium rubber for high quality, strength, corrosion resistance, and the ability to withstand high temperatures. Specifications: Condition: New Type: Duck Bill Valve Kit Number of Pieces: 4 Material: Rubber Color: As shown Fitment Type: Direct Replacement Part Number: 385310076 Fitment: This duck bill valve kit is compatible with Dometic S, T, VHT, and VG series pumps. Fits models S12D, S12DAB, S24D, S32D, S115A, S12, 52A, S32, T12, T24, T32, VG12, VG24. Package Includes: 4 x Duck Bill Valve Kit Note: 1. The actual color may vary slightly from the images due to monitor brightness or lighting conditions. 2. Please allow slight variation due to manual measurement.