Dixon® Swivel Nut Elbow, 1/4-18 x 7/16-20 Nominal, Female NPSM x Male SAE O-Ring Boss™, 90°, 4500 psi, Steel, Zinc Plated, Domestic Dixon® 6901-4-4 Swivel Nut Elbow, 1/4-18 x 7/16-20 Nominal, Female NPSM x Male SAE O-Ring Boss™, Steel, Domestic