iFJF R12T Nylon Water Bowl of Fuel Filter/Water Separator 120AT NPT ZG1/4-19 fit Diesel Engine-Set of 3-

R12T water separator and filter complete combo installation instruction: 1.Nylon collection bowl down when installed the water separator and filter. 2.There are 4 ports,two inputs and two outputs.We provide two plugs for the extra two ports.If you need to use two plugs,you must install them to the filter and tighten them. 3.Before installed the filter,you have to remove those plugs,teflon-tape them,and re-install them.Prevent leaks from these plugs. 4.All of the above steps are very easy to operate, you'd better use the tool to install tighten.