550 Series Cutter Style One Piece Straight Stepped Hose End -10AN to -12 Hose 501-12-10S AF501-12-10S Silver Finish. Suits 100 & 450 Series Hose STEPPED STRAIGHT END -12 HOSE Aeroflow's expanders and reducer's cutter style hose ends with Aerospace triple seal/double o-ring are made from 6061-T6 aluminium. This design ensures a secure, leak free connection every time. Aeroflow's 550 series are CNC'd with superior wall thickness, a must for any serious racer. Aeroflow's corrosion resistant, colour consistent, hard anodised (excluding silver) and hand polishing adds the final touch of quality and protection you have come to expect from Aeroflow.