· Type: Compression · Construction Material: Brass · Connects 3/8" Copper, Nylon, or Stainless Steel Tubing · 1000 PSI Rated Assembly Instructions 1. Loosen the nut on the fitting. 2. Insert the tube into the fitting. Be sure the tube is bottomed on the fitting shoulder. 3. “Hand-tighten”. Then wrench the nut until it is snug and does not leak.