PRO-Fit quick connect fittings are designed to connect refrigerant lines without an open flame, brazing, or swaging. Provides leak free connections for refrigerant lines. Join refrigeration lines in seconds by simply cutting the lines, deburring the ends, and push to connect. Single-use with quick-release removal; robust brass body, durable and reliable. Quick connect union's are a time saving, innovative solution that eliminates system refrigerant leaks due to poor flaring or incorrect torqueing and brazing. leak-proof double O-rings sealing. 3/8" union; for HVAC/R up to 870 psi (60 bar). Recommended for residential use, coated aluminum linesets, mini-split HVAC units, unitary indoor coils. Compatible with major refrigerants. FOR THE TRADESMAN: RectorSeal is recognized as a leading provider of quality solutions for the professional trades serving heating, ventilation, and air conditioning (HVAC/R), plumbing, electrical, and construction markets.