Sizes from 3/16" to 5/8" inch. Construction: The hose has a nylon barrier between two elastometric layers, a fabric braid reinforcement and a heat and ozone resistant elastomer cover. Application and Temperature Range: Refrigerant r-12,r-134a and r-22 within a temperature range of -22F to +257F (-30C to +125C). Fittings: 26 Series 21 Series 23 Series