ALL FITTINGS FIT REDUCED BARRIER TYPE HOSE AND ARE BEADLOCK STYLE, REQUIRING AN A/C HOSE CRIMPING TOOL. Excellent QualityAir Conditioning Fitting, Ho se Splice, #10 1/2" I.D.REDUCED (49/64" O.D.)Barrier Hose, Crimp On Fitting With R134a 13 mm (Blue Cap ,Low Side)Service Port.