Here, you are looking at the Tomei Type-L Fuel Pressure Regulator. This is a great addition for those of you with an upgraded fuel system that includes a larger volume fuel pump and injectors, and you need proper control to handle the increased flow. 4.5mm Vacuum hose nipple. Adjustable bolt allows for ease of pressure adjustments. Lock nut keeps your settings from changing from your vehicle’s vibrations. Mounting bracket included for ease of installation. Pressure sensor connection to allow a gauge sensor to be fitted during setup. 1/8 NPT fuel inlet. 1/8 NPT fuel exit. (2) 6AN adapter fittings included. (2) #8 nipples included.