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Danny...pretty sure the one side of the SHARK fitting that screws onto the faucet threads needs Teflon tape. I've never seen a Pex fitting with a washer in it...I'm talking elbows/couplings/tees (you said most fittings) those plastic ones that screw onto faucets yes they do. The water pressure has nothing to do with the leak IMO. A good connection will not leak regardless of the pressure unless it's extreme...then you'll want it to leak or it will probably burst.
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