- A wide range of products are offered to suite many applications and environments. Butt Weld Plugs provide maximum protection from damage and contaminants for butt weld ends on valves, pumps, and heat exchangers. Profiles are strapped to help prevent loss and for ease of replacement and marked with direction of fitting / removal. Our High Temperature Masking Plugs have excellent chemical resistance and are designed to excel in even the toughest of applications. Tube inserts are pushed into the ends of hollow tubes that are used to create furniture, shelves and racks. Our inserts protect the ends of the tubes, covering sharp edges and act as either an end cap or a load bearing foot.