ARKSEN HVAC A/C Refrigeration AC Manifold Gauge Set for R134A Blue Gauge (Low): 2-1/2" Diameter, 0-120 PSI With 0-40 VAC Red Gauge (High): 2-1/2" Diameter, 0-500 PSI Red & Blue 6 Feet Long Charging Hose ( 1/4" FFL X 72" With Knurled Fittings) Yellow 6 Feet Long Charging Hose (1/4" ACME X 72" With Knurled Fittings) Each Coupler Have A Shut Off Valve To Prevent Loss Of Refrigerant