... with gauges,piston valve at two ends and diapgagm valve in the middle Description: Gauge Type:1.Pressure& temperature ... unit: PSI/Kpa ,oF/oC; Refrig scales& gauge ... temperature unit: PSI/Kpa ,oF/oC; Refrig scales& gauge diameter: R-410a, R-22, R-404a, 80mm ... unit:PSI/Kpa ,oF/oC; Refrig scales& gauge diameter: R12, R-22, R502, 80mm/3.5" ...