Manufacturer Dive Rite
Product Code : HOAD4
The 9/16-inch male end screws into the second stage end of an ordinary LP regulator hose, and the other end of the adapter is a Quick Disconnect BC female slide-lock Schrader valve fitting that accepts the standard BC inflator male QD post.
Second, You may unscrew the base portion to allow the upper portion only to screw directly into a first stage LP port that is 3/8" thread size and it can serve as a "lift bag quick inflator" adapter. All pieces are included to allow for either function.