We, 21 Engineering Co., are the leading company in PVC cement and caulking gun. Since the establishment in 1998, we have been doing our utmost to supply our best qualified products to customers. We developed PVC cement which is special-brush in the cap and it brought more convenient PVC piping works. Also, in 2008 we developed non-leakage and one touch auto-released caulking gun. It surely gives you comfortable works.