A male-to-male reducer taking AN4 down to AN3, both ends using the standard 37-degree AN flare. At this end of the range the parts are typically doing precision work rather than bulk flow: pressure gauge feeds, sender plumbing, clutch and brake circuits, and small vacuum or fluid takeoffs. This reducer lets an AN4 port feed an AN3 line without stacking two separate adaptors in a tight space. Both ends are male, so mate them to female swivel hose ends or female couplers. Small flares are easy to over-torque and distort, so tighten to a firm seat and stop; the cone seals on contact, and sealant is never required.