The FloPlast 110mm Black 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 to will allow 32mm, 40mm and 50mm waste pipes to be connected to the soil stack.