Dry non-fillable.
2" dial. PIC Gauges 2" UNO Pressure Gauge, 1/4" NPT, Dry, 0/200 PSI, Lower Mount, 501D-UNO-204G Pic gauges 2" uno pressure gauge, 1/4" npt, dry, 0/200 psi, lower mount, 501d-uno-204g "use no oil" pressure gauge designed for use on compressed gas regulators and tanks.