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My take on the OP is that the PRV is faulty. 110 psi is rather high-something on the order of 50-60 is the norm. If you're experiencing pressure drop when an additional appliance is flowing, there's another problem, as in crud inside the pipes causing restriction in gallonage delivered. Don't know why anyone would consider plumber's putty to be an outdated product. Every faucet, drain, and sink basket that I've installed calls for it. Loosening the retaining nut of a kitchen sink basket may be a stinker if you don't have the correct wrench. I've used a large Channellock pliers (jaw opening 6"), but that isn't in every homeowner's toolbox. If the nut is cast metal and is frozen to the basket, it may prove easier to use a Dremel tool with a cutoff wheel and slice through the nut, (don't bitch up the sink!) and then split the nut off the basket with a screwdriver.
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There ain't nothin' more powerful than the odor of mendacity -Big Daddy
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