
The Story
The original plastic fuel filter cap on your L5P Duramax is susceptible to rounding off when replacing the water separator. Also, the plastic can crack during extreme cold weather conditions. To solve these problems, the FASS cap is made with 6061 billet aluminum. It uses the same 36mm socket for removal and is equipped with a drain valve for tool-free draining! This cap will work with either the factory housing or the FASS L5P Drop-In Series Systems. Upgrade your plastic fuel filter housing with a Billet Fuel Filter Cap from FASS!
NOTE: to get FASS warranty coverage for your product you must fill out their registration form here.

Details & Craftsmanship
Every detail has been carefully considered to bring you the perfect product.
Description
The original plastic fuel filter cap on your L5P Duramax is susceptible to rounding off when replacing the water separator. Also, the plastic can crack during extreme cold weather conditions. To solve these problems, the FASS cap is made with 6061 billet aluminum. It uses the same 36mm socket for removal and is equipped with a drain valve for tool-free draining! This cap will work with either the factory housing or the FASS L5P Drop-In Series Systems. Upgrade your plastic fuel filter housing with a Billet Fuel Filter Cap from FASS!
NOTE: to get FASS warranty coverage for your product you must fill out their registration form here.
























