Hi, I am having a new water meter installed and I want to be ready to hook up immediatly so have correct parts on hand. They said it will have a "3pc Union with 1" Female NPT Threads" I can see that I need a 1" NPT x 1" PEX brass fitting. My question is - Do you use thread sealant (pipe dope) OR a hign quality neoprene washer? OR Nothing except tighten the crap out of it? Whats the best method to make sure that crucial connection doesn't leak? Thanks anyone.