Non-return valve suitable for installing into various Nuova Rade (and other) thru hull fittings. 

Round external flange, tube and rubber disc non-return valve to prevent water entering the boat. 

22mm is suitable for:

 - 43499 black 7/8" thru hull

 - 43497 white 7/8" thru hull

 - 43498 grey 7/8" thru hull

 - 43491 black 7/8" thru hull

 - 43489 white 7/8" thru hull

 - 43490 grey 7/8" thru hull

25mm is suitable for:

 - 10251 white 1" thru hull

 - 70597 chrome 1" / 19mm thru hull

 - 70598 chrome 1" / 25mm thru hull

 - 43537 black 1" threaded thru-hull

 - 43535 white 1" threaded thru-hull

 - 43536 grey 1" threaded thru-hull

 - 43529 black 1" threaded thru-hull

 - 43527 white  1" threaded thru-hull

 - 43528 grey 1" threaded thru-hull

 - 47758 cream 1" threaded thru-hull

 - 196073 black 1" threaded thru-hull

 - 47122 white  1" threaded thru-hull

These should fit other thru hull fittings with a 1" (internal diameter) outlet

Diameter of outer flange: 37mm

Length of outer flange: 6mm

Stepped diameter of connector: 26mm / 24mm

Length of connector: 12mm

Internal diameter: 20mm

Cutout required: 26mm