Craft’s self-sealing brass couplings allow for charging the refrigeration, air conditioning, and heat pump systems without the use of brazing. These couplings are extremely easy to use and are compatible with a wide range of refrigerants. Such as R290, R454C, R410A, R448A, R449a, R513A, R134a, R407C and more… They range from 1/4” – 3/4”, and the connections are customizable to the core. The only coupling that works with A3 (R290) refrigerants and is UL listed.