Black anodized aluminum ORB reducer fittings are designed to reduce a male AN fitting down to a smaller male AN size.

Flare will be on the larger side.
O-ring will be on the smaller side.

If used as inlet fittings on fuel pumps:
-12/ -8 Accepts -12 AN hose fitting and fits the small body pumps with a -8 port.
-10/ -8 Accepts -10 AN hose fitting and fits the small body pumps with a -8 port. Ok for small pumps (-0, -1/2) pumping gas or methanol.
-16/-12 Accepts -16AN hose fitting and fits the large body pumps with a -12 port.