Jabsco INlet Non-Return Valve- 34 I.D. A check valve give quicker and easier flushing response on many manual and 37010-Series electic toilet installations For use with manual and electric toilets using sea water flush. Simply fit in inlet suction hose, near seacock but just above waterline. Prevents loss of prime in above waterline installations. Retains water in bowl of 37010-Series electric toilets installed above waterline Fitting Connections for 34 I.D. Hose. Size 4-12L X 2-18W X 2H Califor