The FloPlast 110mm Grey Strap on Boss allows you to add a waste pipe to a soil system without the use of a fitting. Simply calculate the point at which you want the waste pipe to enter the soil pipe, cut a hole in the pipe using a 54mm - 56mm hole cutter and locate the strap boss. Once located fit the appropriate adaptor and it will allow 32mm, 40mm and 50mm waste pipes to be connected to the soil stack.