AN Double Headed Wrench - 04 AN B-nut - 03 AN S-nut

Finish Line Factory’s Double-Headed wrenches represent an upgrade over our standard wrenches. Each wrench is sized to fit either the B-nut or the S-nut of each hose end. The B-nut is the part of the hose end that fastens the hose, the S-nut is the part of the hose end that fastens the fitting to the male flare.