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Old 08-10-2012, 01:09 PM   #2
Marin
Scraping Paint
 
City: -
Join Date: Oct 2007
Posts: 13,745
Two sizes will fit, a skinny one and a fat one that is almost the exact diameter of the hole. We usuall use the fat one. Take the cap to a marine store to get the proper size if you don't have the old zinc as a reference anymore.

Do not put anything on the threads. The zinc requires electrical continuity with the exchanger to do its job. The threads are tapered so the cap tightens up as you tighten it down. Don't overtighten it, just make sure it's a good snug fit. We have never had any leaking problem around ours.
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