The McAlpine MAC-1-BTW 90-114mm Inlet x 4"/110mm Outlet Short Straight WC Connector is a plumbing fitting used to connect a toilet bowl to a soil pipe. It has a 90-114mm inlet that fits the toilet bowl waste outlet and a 4"/110mm outlet that connects to the soil pipe. This particular connector is a short straight type, meaning that it has a straight connection between the inlet and outlet, which makes it suitable for use in spaces where a longer connector cannot be used due to limited space.