My anti-syphon valve on my 83 Cat.30 is below the sink on the starboard side. The hose runs from the heat exchange unit up under the sink to the anti-syphon valve and back down into the exhaust elbow towards the muffler. When I purchased my boat, the valve was in terrible shape. I bought a new one at West Marine which has held up well. I check it every few months.
Check link below, once opened, scroll down to second page of link to find part number and location etc.I have a 81 Catalina and it is located under the sink on the port side, just like the picture on the link below.Good luck with it.Ron S/V Seascape
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