FMSI > Air Conditioning System > Service > Aluminum Tube Joining Repairs Aluminum Tube Joining Repairs Request Information Aluminum Tube Joining Repairs aluminum-tube-joining-repairs Tube Joiner Tool (2) a1956.jpg Tubing Joiner Tool Jaws (5) a1957.jpg Lok Prep Sealant An anaerobic sealant that fills grooves to ensure the integrity of the tube connection. Lok Prep must be used with every connection. a1959.jpg Tube Cleaning Scuff Pads a1960.jpg