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Old 08-14-2010, 10:22 PM   #1
1 Rivet Member
1970 29' Ambassador
Euless , Texas
Join Date: Sep 2009
Posts: 15
Fresh Water Drain Valve Thread Size

Will a Dual Thread Fresh water drain valve at 3/8" and 1/2" made by Camco fit the fresh water tank on a 70 Ambassador? My old valve outside diameter is 5/8".

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Old 08-18-2010, 08:24 PM   #2
1 Rivet Member
1970 29' Ambassador
Euless , Texas
Join Date: Sep 2009
Posts: 15
Follow up to my original question is yes. I discovered the 5/8" outside diameter fits a 3/8" hole in the plastic plumbing department. The key is how measurements differ between metal and plastic threads. I learned the plastic threads on my drain valve are each tapered, unlike metal threads. As the plastic part is turned inward it gets tighter in the whole. That is what I learned.
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