Reply to "Suggestions or advice for pressure and expansion tank caps"

Rocky is correct. The diameters are the same and depths are different. The Euro neck is taller than the US neck. I just measured the depth of two different US tanks and they 3/4" deep. I am guessing that the Euro neck is between 1/8" and 3/16" taller.

Since the correct fitting Euro pressure caps are essentially unavailable in the US, an easy workaround is to use a higher pressure cap. Maybe use a 24 pound cap instead of 16.

Also, I added some holes in the modified cap for the overflow tank to help insure it does not act a pressure cap.

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11/1/227:02 AM

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