absolutely love this place because they take time to talk with you. the valves where not easy to define what pair and how many I needed. called and they helped me figure it out.
The duck bill valves are essential to maintain in good condition to be able to maintain vacuum in the system, and should be replaced every 2 years or so depending how much you use the system. Worn valves will cause the system to run longer than needed to reach optimum vacuum and can cause excessive ware on the vacuum pump.
SeaLand Duck Bill valve 2 pack -Single part number is 347802
Used for all SeaLand S-Series Vacuum pumps and T- Series Discharge Pumps
Also Fits all Vacuum Generators with an S - Series Vacuum Pump