Anti-syphon Airvent with Valve

Often found in engine bays for use with inboard engines,  for various hose fittings, this Antisiphon device can be used on exhaust lines, seawater connectors and WCs installed under the floating line.

This item is unbranded, but very similar to that of the Vetus equivalent. 

Feautres:

Hose sizes 13mm / 19mm / 25mm / 32mm (1/2"-3/4"-1"-1"1/4)