Includes air regulator, 0 – 100 PSI pressure gauge, plugs for water and oil cooled oil pumps, gasket and needed hardware, Only fits Feuling oil pumps, will not work with factory Harley-Davidson oil pumps, The spring tension can be adjusted to achieve the desired pop off PSI, Allows the engine builder to know what PSI the relief valve opens, Feuling oil pump pressure test tool for Feuling M8 oil pumps, Made in the U.S.A.
