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Currently have shut-off valves on Gasoline tank supply lines to the engine. I want to add some anti-siphon valves. I want to thread the anti-siphon valves into the tank fittings then thread the shut-off valves onto the anti-siphon valves.

So it would be, Tank --- Anti-Siphon Valve --- Shut Off Valve --- Supply Line.

Does anyone see a problem with this setup?

Thanks

No.
As long as your engines have carbs and not FI.

Thank you. Making sure there wasn't an ABYC guideline that I was missing.