Step 1 Apply Teflon Tape or Pipe Joint Compound to The Male Threads.
Step 2 Screw the fitting in Hand Tight
Step 3 Using A Pipe Wrench Screw The Fitting down until tight
Step 4 Lester Says" Don't over tighten the nut"
Step 6 Turn on water and check for leaks Lester Says" If the fitting leaks turn off water then tighten the fitting 1 more turn.
Use photos to ID your replacement parts. Lester Says "If you left click your mouse you can download the photo and use your photo software to size to full size to to make sure the part is what you need.