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
Auto shut-off valves automatically retain refrigerant in the service
hose when they are removed from the system, meet EPA, SAE, and UL
standards for containment of refrigerant.