◆ Reducing socket: joins two different-bore threaded pipes in line ● Galvanised mild steel, hot-dipped galvanised finish ▲ AS 1722.1 / BS 21 BSP taper threads, standard malleable iron / mild steel fitting dimensions A galvanised mild steel reducing socket that joins two different-bore threaded pipes in line. Hot-dipped galvanised finish gives outdoor and damp-service durability from the zinc layer. Threads are cut to AS 1722.1 / BS 21 (BSP taper), the standard Australian pipe thread. As a pipe coupling in the AAP range, it pairs cleanly with the rest of the galvanised steel pipe fitting line.