2-1/2″ Pressure Washer Gauge, Pressure Gauge Kit, 3/8 Inch Quick Connect, 0-6000 by | Jul 21, 2026Pressure Washer Gauge Kit. Features a 1/4″ NPT radial port for strong installation compatibility. Boudon tube : Copper alloy. Working temperature : -4 to 140 deg F/-20 to 60 deg C. Ambient temperature : 140 deg F/60 deg C maximum.