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. Longer dip tubes can be purchase separately . This would enable you to make a keg out of any pressure vessel if you wanted to. The assembly can also be fitted to our MKIII and MKIV regulators, gas manifolds, Bottle Filler Beer Guns (very useful)  and various other items.