Auto Meter 3224 Copper Tubing For mechanical pressure gauges (except fuel, nitrous, or brake pressure gauges) Includes 6 feet of 1/8 inch copper line and 1/8 inch NPT male to 1/8 inch compression fitting 1/8 inch NPT female to 1/8 inch compression fitting, grommet and 1/8 inch NPT to 1/4 inch NPT bushing Comes with necessary fittings Quality unmatched by any other gauge accessory on the market