2-1/2″ Pressure Washer Pressure Gauge Kit, 3/8 Inch Quick Connect, 0 by | Jul 21, 2026Boudon tube : Copper alloy. Working temperature : -4 to 140 deg F/-20 to 60 deg C. Process connection : 3/8″ quick connection, socket and plugs. Ambient temperature : 140 deg F/60 deg C maximum. Connection : Brass, two piece design.