3 16 vs 1 4 brake line July 8, 2019 16 32 64 128 3 16 1 4 brake line adapter 3 16 to 1 4 brake line union 3 16 to 1 4 brake line adapter napa 3 16 to 1 4 brake line fitting 3 16 x 1 4 brake line adapter 3 16 to 1 4 brake line coupler 3 16 to 1 4 brake line adaptor