This adapter is used in several kits to enable the fitment of a pressure sender which is often too large to fit in a small spaces available. Typical uses are the Rover 3.9L EFi V8 engine, Toyota 1HZ Ford Ranger etc. This extension pipe adapter is required due to space limitations. You will additionally require a running Tee, a 18JIC14BSP fitting (as per the image shown) and the 5 or 10 bar oil pressure sender.