This mechanical manifold gauge set with three valves and hoses is made of brass. It has 36 inches hose length and a 1/4 inch vacuum port. The gauge has an accuracy of +/-1.00% with a high side in red ranging from 0 to 800 pounds per square inch and a low side in blue ranging from 0 to 500 pounds per square inch. It meets the UL standard and is compatible with multiple refrigerants.