Required for installation of 30 psi Fuel Pressure gauges on pre-injection pump Diesel Applications in order to protect sending units from excessive pressure spikes during start up. 1/8 NPT Male to 1/8 NPT Female. Product Features:1/8 NPT Male to 1/8 NPT FemaleRequired for installation of 30 psi Fuel Pressure gauges on '98-02 Dodge Cummins Diesel Applications in order to protect sending units from excessive pressure spikes during start up Required for installation of 30 psi Fuel Pressure gauges on '98-02 DodgeManufactured from stainless steel