Mastercool 40336 Set of 3 (Blue, Yellow, Red) 36" Standard Hoses - With a working pressure of 750 PSI and a burst pressure of 3,000 PSI and standard 1/4" fittings. 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.