The Aeroflow Performance range of air conditioning weld on fittings are specifically designed for fabricating custom air conditioning lines. They will work with our entire hard to find air conditioning fitting range available in Aeroflow's range of fittings and adaptors. Each weld on is either made in male or female ends with the O-ring sealing grove located in each one to work with R-134A refrigerant. Made from stainless steel it can be welded to almost anything and available in #6, #8 and #10 air conditioning fitting sizes.