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I’ve never seen a valve or drain dedicated for an expansion tank. Sounds like a waste of time and fittings, and therefore money. A rag and a bucket are coming in if there’s a drain or not. Why complicate it, to save yourself 45 seconds every 5 years it needs swapped out?

I'm with you, I've never seen an isolation valve (is that code legal?) nor a low point drain. Hell, prep the new tank and swap it out while water is gushing out if we wanted to compare ideas.
 
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