Yescom 3pcs Set Color Coded R410a Straight Ball Valves for Ac Charging Hoses Connect Manifold Designed for standard 1/4" SAE refrigerant charging hoses HVAC, HVAC/r, A/C service Tech hand tools Approved for R410A refrigerant Brass valves are color coded on knobs 1-Red, 1-Blue and 1-Yellow