YELLOW JACKET 49987 Mechanical Manifold Gauge Set, 4-Valve. Mechanical Manifold Gauge Set, Number of Valves 4, R-134A, R-22, R-404A, Number of Hoses 4, 60 in, 0 to 800 psig, 30 in Hg to 350 psi, +/-1.00 Percent, 3/8 in, Forged Aluminum Alloy, 1 Percent Accuracy Gauges, UL Recognized. Light Industrial Equipment & Tools. This listing is currently undergoing maintenance, we apologise for any inconvenience caused.