22mm (Half inch) black steel fittings. These are half inch 15mm internal and 22mm outside diameter plumbing pipe fittings and plumbing pipe lengths in Black Steel finish threaded as 1/2″ BSTP. Finish with diluted Raw Linseed Oil to make rubbed iron furniture and decorator components.
This is a pipe and fitting that Bunnings and Reece refer to as 15mm