Mastercool 84364 36" Black R134a Hose with 1/2" ACME-F Fittings without Shut-Off Valve. Hose Mastercool uses only (GRADE 5 HOSE) with a selection of Standard and Nylon Barrier for high pressure applications. Knurled brass nuts make finger tightening easy. Crimped with 8 segment dies for secure fit and maximum durability. Hoses are available in sets and a variety of lengths to meet all EPA, SAE, and UL requirements for containment of refrigerant. This is a single Black hose.