This boss adaptor is essentially a blank end that has been drilled and tapped with a 2andrdquo; BSP thread.It can be used to connect waste pipes into another fitting.As cast iron push fit soil pipes and fittings are all plain ended, a coupler is required to connect this boss adaptor to the receiving fitting.All of our push fit cast iron soil fittings are treated to a factory black two-pack gloss paint finish. The whole range is manufactured in grey cast iron to BS EN 1561.This soil pipe range is particularly well-suited to installations in public buildings, listed buildings and conservation projects. It is 100% recyclable.Click here to view or download full installation instructions.