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Extra large sight glass Fahrenheit Degree (F) Reading Quick disconnect couplers for high/low fittings included Each coupler have a shut off valve to prevent loss of refrigerant Blue Gauge (low): 2-1/2" diameter, 0-550 PSI Red Gauge (high): 2-1/2" diameter, 0-750 PSI Red and Blue 60" long charging hose R12, R22, R134A x 60 " with knurled fittings SAE ( 1/4" FFL x 60 " with knurled fittings) Yellow 60" long charging hose R12, R22, R134A SAE x 60 " with knurled fittings 1/4" fitting Black Hose is 60" with 5/8" Fitting