Fit Hose Inner Dia: 12mm; Female Thread Size: G1/2(Approx ID 18.6mm). The female thread end is connected to a fixed male tube, and sealing tape is added to ensure the sealing effect. Barb end is connected to a hose. Female straight barb fitting is made of brass, which has good resistance to high temperature and corrosion. Barb design is convenient and easy to use. We suggest putting the hose in hot water a few seconds if it is too small to install. In addition, adding a pipe clamp can effectively prevent leakage and slip off. (sold separately) Used widely in gardens, leaking pipe repairs, swimming pools, air compressors, dryers, bathrooms, fuel tanks, water tanks, water heaters, washing machines, etc.