Aluminium Expandable BungsDescription Aluminium Expandable Bungs for purging applications where inflatable purging systems, paper dams or water soluble film may not be available or practical. Ideal for purging out of round and oval tubes, or in 'elbows', 'tees' and other fittings due to the function of the expanding rubber seal. Features Solid cast aluminium ends Flexible, expanding rubber seal Seals out of round or oval tube Purge solution for 'elbows', 'tees' and other