This anti-siphon safety device for all boat toilets installed below the vessel's static or heeled waterline, is a simple valve system that ensures water cannot siphon over pipe loops. The vented loop is moulded in tough plastic. 

Specifications:

Connections - for 19mm (¾”) bore hose.
Dimensions - ¾”- 70mm high, 100mm wide, 25mm deep.
Anti-siphon safety devices for all marine toilets installed below the vessel’s static or heeled waterline.
Simple valve system ensures that water cannot siphon over pipe loops.
Moulded in tough plastic.
For flush water inlet loop.
Packaged Dimensions: L:6.00 x H:16.00 x W:24.00cm.
Actual Weight: 0.03 Kg (Approx. 0.23 Kg packed).