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post #35 of Old 08-15-2013
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Re: Removing Hot Water Heater


You are correct, it is "metric" or actually Japanese Industrial Standard JIS B 0203, which is identical to British Standard Pipe or DIN which the Japanese adopted some time back. That's why the drawings indicate "3/8" because the thread pitch is actually measured in inches. But it is not the same as US NPT pipe thread in either pitch or taper angle (I was wrong). Very confusing but the right plugs are readily available. The Yanmar numbers are correct, but may be more expensive than from other sources like McMaster Carr (I love those guys).

Good catch.


Last edited by DaveMancini; 08-15-2013 at 03:32 AM. Reason: correction
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