150-degree push-on hose end in AN4 (-4), pushing straight onto socketless hose and gripping the barb without a clamp or crimped socket. AN4 is the smallest size in the range, so it lands on gauge and sender feeds, vacuum and boost reference runs, small breathers and low-volume returns. One hundred and fifty degrees is very nearly a reversal, and it answers a port pointing directly away from the run with no space to loop the hose by hand. It moves very little volume by design, so keep it off anything that has to shift fuel or oil in quantity. Intended for push-on hose only, not braided hose built for a two-piece compression end.