Robinair 18192 R-134A Manual Replacement Coupler Set Designed to connect Robinair Enviro-Guard hoses to service ports on automotive R-134a A/C systems Quick-connect design includes an integral safety sleeve which protects against injury and refrigerant loss if the coupler is disconnected under pressure Compact design easily fits into tight quarters The 6-ball coupler design provides a more stable grip on the fitting than lesser 4-ball designs Set includes 1ea. low-side and high-side manual couplers Robinair 18192 R-134A Manual Replacement Couples Set Robinair Manual Replacement Couples Set Field service connect to the special Enviro-Guard hoses to allow access to service ports on automotive R-134a A/C systems. The quick-connect design has an integral safety sleeve, which protects against injury and refrigerant loss if the coupler is disconnected under pressure. The compact design easily fits into tight quarters, which is especially handy for retrofits. Six-ball couplers provide a more stable grip on the fitting than do couplers with four balls. Set includes a low and high manual coupler. Quick-connect design has an integral safety sleeve which protects against injury and refrigerant loss if the coupler is disconnected under pressure Compact design easily fits into tight quarters Six-ball couplers provide a more stable grip on the fitting