When mounting your oil filter, you need lots of options. Sometimes the lines will go all to one side, and sometimes in opposite directions. Mate this holder with our 90 degree brass fittings, and you will have a lot of options in your system. Supplied with 3/8″ NPT threaded holes. Most common high performance oil filters such as the Fram HP-1, Wix, and even Rabbit filters will fit this holder.