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Things to remember:

If the fixture from Home Depot doesn't fit, check with the local RV dealer. If you have to replace a faucet or fixture, consider using standard plumbing. Later repairs will be easier as parts are more readily available.

If you use PEX piping, Sharkbite is your friend.

Standard 1/2 inch couplers do NOT fit on the RV/mobile/manufactured fixture and will strip the threads; check out Flare-It fittings.