18" Gauge Line Kit for use with aftermarket mechanical oil and fuel pressure gauges. Kit comes with one 1/8 NPT Female to A.N. 4 Male fitting to screw on the back of the gauge and one 1/8 NPT Male to A.N. 4 Male fitting for the engine side of the connection. Both fittings are zinc plated steel and the hose is rated 3000 psi working pressure.