- 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. Read more about types, materials and applications in The Buyer's Guide to Caps & Plugs, The Design Engineer's Guide to Caps & Plugs and The Ultimate Guide to Caps & Plugs.