This product IS NOT intended to be used directly on a fuel rail port. 

INCLUDED
-Fuel pressure regulator-damper
-Aluminum mounting bracket
-Aluminum 6AN male adapter (x2)
-Aluminum 8AN male adapter (x2)
-Aluminum 1/8" NPT port plug
-Interchangeable return orifices
-M6x1mm mounting hardware
-Boost referenced Y-adapter
-Vacuum Hose, 5/32" ID

The high flow 1:1 riusing rate design has been tested to regulate over 1,400 liters per hour (see MORE DETAILS tab). Two interchangeable orifices are included to match the amount of fuel bypassed for the application. This added precision will resist diaphragm flutter and optimize pressure stability. Furthermore, with the addition of interchangeable return orifices, the regulator is a good match for big to small powered engines. 
Fuel pressure is dialed in using the preload set screw on top.

The integrated 1:1 fuel pulse damper stabilizes fuel pressure created by the fuel pressure regulator, fuel pump, fuel injectors, etc. The base pressure requirement for maximum damping efficiency is 40-120psi (2.8-8.3bar). This range is base static pressure only. Any dynamic fuel pressure created by the rising rate FPR outside of this range is acceptable assuming the vacuum/boost reference line is connected.

The inlet (side) port and outlet (bottom) port feature large 10AN ORB (7/8"-14) threaded ports. Two -6AN and two -8AN adapter fittings are included to suit most aftermarket fuel systems. When installing, the O-rings require petroleum oil for lubrication. 
The 1/8" NPT auxilary port can be used for monitoring fuel pressure, temperature, etc.