The Jabsco twist 'n' lock manual toilet pump fits the Jabsco 29090 and 29120 series manual toilets.
The Jabsco manual toilet pump comes complete with base valve gasket included and a single stainless steel screw in case when changing the pump a screw breaks (Not available separately).
The new design uses a remodelled piston in the pump-out assembly. At the end of normal pumping out, at the bottom of the pump stroke, the user simply turns the handle through 90 deg which locks the piston down onto the base outlet valve, keeping it securely shut.Turning the handle to the normal operating position opens the lock again.