The small projection fixed offset is generally used to overcome a step in the wall to which the pipe is beng fixed such as that which is created by a low level brick plinth.
Cast Iron Square Downpipe Eared - 75mm x 1829mm Primed
Cast Iron Square Downpipe Offset - 230mm Projection 75mm Primed
Cast Iron Square Downpipe Bend - 135 Degree x 100mm Primed
Cast Iron Round Downpipe Eared Loose Socket with Spigot - 75mm Black
Cast Iron Round Downpipe Standard Hopper Head H1A Corner Outlet - 150mm Grey Primer
Cast Iron Round Downpipe Offset - 150mm Projection 75mm Primed