Treloar Products

We specialise in engineering and supplying reliable critical fluid transfer equipment for tank trucks, service stations, terminals, depots, gas production plants and more.

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The OPW 99ASV contains no adjustable, replaceable, or repairable parts.









The OPW 99ASV anti-siphon valve is designed to automatically shut off flow of product in the event the line is broken. This feature helps prevent fuel spillage and fire hazards.

All 99ASV anti-siphon valves are equipped with a pressure relief valve, to relieve thermal expansion. They are available in 40mm and 50mm NPT sizes, smaller sizes available on request. Two different hydrostatic head pressure settings are stocked: 3m and 4.5m - other settings also available on request.

Complies with AS 1940-1993.


The 99ASV is recommended to be installed on the top of the Above Ground Tank. See the attached recommended installation, the A measurement from the top of the tank to the lowest point of the fuel supply line is critical for the correct selection of the anti-siphon valve. We recommend the combination of the 99ASV with a 10BM under pump shear valve for maximum protection from fuel spillage


99ASV-2150: Anti-siphon Valve 40mm x 3m
99ASV-2200: Anti-siphon Valve 50mm x 3m
99ASV-3150: Anti-siphon Valve 40mm x 4.5m
99ASV-3200: Anti-siphon Valve 50mm x 4.5m

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