Fuera de Stock New Ask us about availability REGULATOR ACCESORIES Blind Plug UNF 1/2" incl. o-Ring for 1st stage A13910607 7.00 € UNF 1/2" blind plug for LP outlet of 1st stage regulator. Some older Mares and Apeks 1st stages had an LP output with that thread pitch, it was/is the output intended for the main 2nd stage. Add to cart