These ball lock posts include a 1/4 inch BSP thread so you can attach it to a wide range of other fittings. The posts include a 20mm long thread, an o-ring, poppet, locking nut and short dip tube. This would enable you to make a keg out of any pressure vessel if you wanted to.
The assembly can also be fitted to regulators, gas manifolds and various other items.
Both Gas and Liquid posts available.