Toilet siphon 1' x 25mm

1' x 25mm vented ring, siphon or gooseneck valve for nautical toilets or toilets. A safety component for all inlet and outlet pipes of marine toilets installed below the waterline. The simple valve system ensures that water cannot flow into the hydraulic circuit. The internal valve excludes the need for an external vent. made of sturdy anti-corrosion plastic.