If you do not wish to use this port we supply an AN6 port plug to block it
off. Install the o-ring onto the plug, lubricate the o-ring with a small
amount of engine oil and install it into the rail.
The other port can be used with the supplied AN6 adapter as a center
return port, or if you do not wish to run a center return port simply block
it off using the supplied AN6 port plug.
