The Wallas #367200 adapter kit adapts a Wallas diesel product fuel line to a Wallas plastic tank.  The assembly includes a #367403 bronze fuel filter on the end.  First, determine how long your fuel line should be and cut the supplied fuel line (already connected to your new Wallas), leaving 12″ for in the tank.  To install the cap and filter assembly on the Wallas fuel line, simply push the fuel line through the rubber sleeve & screw cap about 12 inches, slide the protection spiral, barrel nut, rubber seal & washer on the fuel line in that order.  With the nut about 1/2″ from the hose end, screw filter into the barrel nut, trapping the seal and washer in compression against the hose end and tighten.  Screw cap on to tank, making sure the filter lays on the tank bottom.  Fits most new Wallas products.