For use with mechanical pressure gauges up to 200 psi. includes 12ft. of 1/8" nylon tubing, 1/8" npt male to 1/8" compression fitting, 1/8" npt female to 1/8" compression fitting, and 1/8" npt to 1/4" npt bushing. do not use with fuel pressure, brake pressure, or nitrous pressure gauges.