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 (part#6097). This would enable you to make a keg out of any pressure vessel if you wanted to.
Note: the liquid post is the one with no score marks