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Anti-Siphon Devices and Antisiphon Valves

An anti-siphon unit is an extremely important part of any plumbing system. An anti-siphon device is recommended for use in installations such as 'below waterline' applications of engines with wet exhausts, toilet systems and pumping systems to name but a few.

Under normal operating conditions, the anti-siphon valve is closed as the water passes in the required direction, pushed passed by the pump. Under fault conditions the weight of the column of water in the hose can create a vacuum causing more water to be drawn into the system and starting a flow of water. Under these conditions the anti-siphon valve will be drawn off its seat and allow air into the pipe, breaking the water column and stopping the siphoning effect. Non-valved anti-siphons work in a similar way, but under normal conditions a small quantity of water flows out of the vent pipe. Air is drawn in should a vacuum be created.

19 product(s). Displaying products 1 to 12
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£22.25 Featured
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Seaflow Brass Anti-Siphon Device Kit (19mm Hose Line / 10mm Vent Hose) Part No. 410031

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£27.00 Featured
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Seaflow Brass Anti-Siphon Device Kit (25mm Hose Line / 10mm Vent Hose) Part No. 410033

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£34.00 Featured
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Seaflow Brass Anti-Siphon Device Kit (32mm Hose Line / 10mm Vent Hose) Part No. 410035

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£17.55
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Seaflow Brass Anti-Siphon Loop (3/4" BSP / 1/2" BSP Vent) Part No. 410014

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£22.63
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Seaflow Brass Anti-Siphon Loop (1" BSP / 1/2" BSP Vent) Part No. 410015

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£30.15
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Seaflow Brass Anti-Siphon Loop (1-1/4" BSP / 1/2" BSP Vent) Part No. 410016

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£20.26
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Seaflow Brass Siphon Break Valve (1" BSP Male / 3/4" BSP Female) Part No. 410025

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£18.98
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Seaflow Exhaust Line Anti-Siphon Device (Fits 13mm to 38mm Hose) Part No. 410081

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£72.50
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Vetus Anti-Siphon Airvent with Valve (13mm - 32mm Hose) Part No. 410052

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£72.50
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Vetus Anti-Siphon Airvent with 4m Hose (13mm - 32mm Hose) Part No. 410053

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£72.50
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Vetus ASD38V Anti-Siphon Air Vent With Valve (38mm) Part No. V-ASD38V

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