Hank -
I think if I made a cut access, I would rather do the cut inside the linen closet - less noticeable. And, I do plan on a peek through the electrical socket.
.
However, with your advice and JRTJH's thoughts, I believe I do have a plan! JRTJH is correct. The Shark Bite is only rated for water. Testing it would give one comfort, but how long would it last?
B&K has a 1/2" Swing Valve Check Valve that is rated to 150# WOG (water, oil, gas). Perfect!
Just install a couple of Flair PEX fittings, and connect the check valve, and I'll no longer have anxieties about water flowing through the transfer switch, or a 50 Amp puddle of water in the basement.
More chores for the Holidays!
Ron
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2011 Alpine 3640RL (Beauty)
(Gone! Now replaced by Beauty3)
2016 Ford F-450 (The Beast)
Diesel 4x4, DRW, LB, CC
Comfort Ride Hitch