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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 19
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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

In stock

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

In stock

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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

In stock

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£19.53
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Seaflow 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

In stock

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

In stock

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£73.33
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Vetus ASD38V Anti-Siphon Air Vent With Valve (38mm) Part No. V-ASD38V

In stock

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£72.50
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Vetus ASD38H Anti-Siphon Air Vent With Hose and Fittings (38mm) Part No. V-ASD38H

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£72.50
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Vetus ASDV Anti-Siphon Air Vent With Valve (13mm - 32mm) Part No. V-ASDV

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£3.87
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Seaflow Plastic Vented Anti-Siphon Loop (19mm Hose) Part No. 507619

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£8.88
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Seaflow Plastic Vented Anti-Siphon Loop (25mm Hose) Part No. 507625

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£6.74
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Seaflow Plastic Vented Anti-Siphon Loop (38mm Hose) Part No. 507638

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£16.38
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Jabsco Plastic Vented Anti-Siphon Loop (19mm Hose) Part No. JAB-29015-0000

Special Order item, lead time will be advised

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