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Dear Jhack,
I apologize, since I misread that you had an Atomic 4. I replaced my last Atomic 4 with a remanufactured Universal 25XP (because I could, based on the footprint) and the riser elbow/anti-syphon system that had been installed after A4 rebulid number two (except for the galvanized nipple between the manifold and riser/elbow) works fine.
Since the 25XP is freshwater cooled you shouldn't have the corrosion inherent with salt water and heat that ate my former wrapped "homemade" riser. The manufactured elbow cost about $130 and I bought brass fittings threaded to hose bib for the connection to the exhaust hose to the Vetus water pot muffler/back flow preventer. Likewise, brass fittings were used for the water injection port.
Since the water injection portion of the elbow is molded above and around the hot gas section, the only "hot" section is the nipple between the manifold and the elbow approximately 2" between threaded ends.
Because my engine is just at or below the water line, anti siphon breaks are important to keep from "sucking water" into the block by excessive cranking that can fill the pot muffler. It's better to close the seacock and reopen when the engine starts than ruin an engine that tries to compress water.
Hope this helps.
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