The Sealand/Dometic duckbill valve kit (385310076) comes with two duckbill valves to optimize your vacuum pump. Failure to regularly replace valves will result in extra burden on your marine toilet system, causing it to need more frequent maintenance and replacement. These valves can be used with all Sealand/Dometic S-Series vacuum pumps and T- Series discharge pumps.
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.