These ball lock posts include a 1/4 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.
Please note the photo shows both in and out post fitted to a lid as a demonstration.
This listing is for 1 x Gas ball lock post with bulkhead.