This is the Fuel Sample Test Port Kit add on if you currenlty have the 1999-2005 Adjustable Fuel Pressure Regulator. It threads into the body of your existing Adjustable Fuel Pressure Regulator (AFPR) and allows you to drain fuel from the trunk off of the AFPR.
This kit comes with a male thread on Aeroquip coupler as well as the corresponding female Aeroquip coupler with adaptor to connect to the fuel line and 4 feet of fuel line.
This Fuel Sample Test Port Kit will not work on it's own. You MUST already have the 1999-2005 Adjustable Fuel Pressure Regulator.