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I need to prevent a hypochlorite tank emptying if the outlet line breaks, I have used a wallace and tiernan suction demand valve in the past but they have stopped making it. The valve would sit between the tank outlet and the pump suction. can anyone help?

I need an anti-syphon valve to prevent a chemical tank emptying if the outlet line breaks. Wallace and Tiernan used to make one but do not anymore. The only ones I can find are to be placed on the discharge side of pumps but mine would need to be on the suction side.