I attach a SharkBite hose bibb to copper, then twist the copper into my drop ear. This allows the system to be pressurized and I inspect all the fittings for water leaks. Plus there's now a water source for mixing mortar, joint compound, etc. Remember, if you're remodeling a bathroom and need help, join our Platinum Membership at https://homerepairtutor.com/platinum-membership/
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