Anti-siphon safety devices for all marine toilets installed below the vessels static or heeled waterline. Simple valve system ensures that water cannot siphon over pipe loops. An essential safety component on all inlet and discharge plumbing of toilets installed below the static or heeled waterline. Features For waste discharge loop Molded in tough, corrosion-proof plastic Internal valve avoids need for external venting Simple valve system ensures water cannot siphon over plumbing loops Specifications Fitting connection ID hose: 1-1/2″ (38 mm) Height: 5″ (12.5 cm) Wide: 7-1/4″ (18.5 cm) Depth: 2″ (5 cm) Weight: 0.5 lb (0.2 kg) Spare Parts and Accessories Valve for Vented Loop