Sealing plug is a device, which helps join systems or mechanisms together by preventing leakage, containing pressure, or excluding contamination. The plug assembly screws into the bore of the access fitting body and is designed to seal the fitting against line pressure. When tee type access fittings are being used, a pipe plug or nipple and shut-off valve is additionally required to the fitting. Various types of plugs are used such as solid plugs and solid plugs.