1 pair of auto air conditioning R134a high and low quick couplings Description. Red and blue quick couplings for R134a car . The quick coupling connection size is 1/4" SAE male. The tank adapter is a 1/2" ACME female x 1/4" SAE male flare for MAC service. This adapter is used to connect 1/4" SAE hose connector to R134a automotive fuel tank. From valve to system, even at operating pressures Specifications. Material: plastic and metal Dimensions approx: 50*25mm Blue: Low side adapter/quick connector (1/4" straight male horn) Red: High side quick connector/adapter (1/4" straight male horn) Package includes. 1 pc blue low side quick connector 1 pc Red high side quick connector Caution. Due to manual measurement, please allow 0.5" - 1" variation. 2.54cm) Please Please check the size measurements and pictures carefully before paying Due to the difference between different monitors, the picture may not reflect the actual colour of the item. Please understand, thank you.