This adapter has inverted flares on both sides. The male side is 5/8-18 and will fit into a fitting that originally had a large 3/8 size tubing with a 5/8 male tube nut. The female side of this fitting is 1/2-20 and the flare size is large.
Carburetor & Fuel Adapter 1/2-20 Male x 5/8-18 Female (5/16x3/8) Inverted Flare
Carburetor Fuel Adapter 5/8-18 Male x 1/2-20 Female ( 3/8" x 5/16")
Rochester Quadrajet 4bbl Carburetor Fuel Banjo Inlet Fitting Adapter Elbow 90*
Redhorse Carburetor Fuel Inlet Fitting 5100-06-1; Adapter Blue -06AN to 7/8-20
CARBURETOR FUEL LINE ADAPTER 5/16" female inverted flare X 3/8" male inverted
CARBURETOR FUEL LINE ADAPTER 3/8" X5/16" = 5/8 18 FEMALE x 1/2 20 MALE