Quickly and easily service your R-134a A/C system with the Robinair 18192 R-134A Manual Replacement Couples Set. Designed to connect to Enviro-Guard hoses, this set includes both low-side and high-side manual couplers, perfect for retrofits and automotive A/C maintenance. Its compact, six-ball coupler design ensures a secure grip in tight spaces while providing essential safety features, including an integral safety sleeve that guards against injury and refrigerant loss during pressure disconnection.