The Robinair 19716 is a 6-foot R-134a sample hose constructed of a nylon inner tube and a polyurethane outer tube. The inner tube handles all refrigerant transfer and provides containment up to 300 psig. The outer tube provides protection of the inner tube from abrasion, nicking, cutting, etc. The hose is provided with an instrument inlet port mating connector on one end and an R-134a low-side coupler on the service end.