This SAE Standard covers fittings@ couplers@ and hoses intended for connecting service hoses from mobile airconditioning Systems to service equipment such as charging@ recovery and recycling equipment. (Figure 1) This specification covers service hose fittings and couplers for MAC service equipment service hoses@ per SAE J2843 and SAE J2851@ from mobile air-conditioning systems to service equipment such as manifold gauges@ vacuum pumps@ and airconditioning charging@ recovery and recycling equipment. Purpose The purpose of this SAE Standard is to establish specific but unique fittings@ couplers@ and hoses for service equipment used in maintaining R-1234yf systems. This is necessary to avoid cross mixing of refrigerant and lubricants from other refrigerant systems. This standard applies only to systems specifically designed to use R-1234yf. Hermetically sealed appliances and refrigerated cargo systems are not covered by this document.