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What is the code for the application for an anti-syphon valve in the fuel supply line at a day tank.
My one is called NRV102. It's over there - just downstream of the tank isolation valve MV101.
I don't know what the code is but if the supply from the tank and the return to the tank are lower that the tank there should be anti-syphoning valves. In the US contact the local Fire Marshal for advice.