WoWAutoPart is now introducing the "ONLY" adapter you will ever need! Why limit the filter sizes you can attach to your barrel when you no longer have to. With our three stage custom threaded adapter, you now have the luxury of converting your .578 x 28 RH threads to 3/4-16, 13/16-16, and 3/4 NPT. This adapter is exactly what you need.
Internal Thread: .578 x 28 RH
External Thread: 3/4-16, 13/16-16, and 3/4 NPT
Material: Black Oxide Steel