You do know what a banjo is don't you? Round flat thing with a tight drumhead and a neck with strings?
The banjo fitting is a round device with a large hole in the center and a fitting on the side -- looks like a banjo (or a lolipop with a hole in it).
The hose for whatever goes on the side, the bolt is hollow with a hole drilled at a right angle into the hollow.
Take two aluminum or copper washers to seal. Peter
