... which contaminates expensive refrigerants3 Rubber layer for permeation, braid for strength, and outer cover for protection1 Double barrier protectionMoisture barrier provides ... charging hose, W.P./B.P.: 600psi-3000psi is available2 For 3/8'', 1/2'', 5/8'' charging hose, W. ... and lower, hoses longer than 8’ not recommended for evacuation 1/4'' SAE Charging Hoses with valve For All Refrigerants (PR3002)