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Expando can be a savior when working on threads 2-1/2" and larger, but be prepared to use alot of heat to get it apart again. Years ago I worked for the mechanical company that piped the plumbing and hydronic heating systems on the sports arena the houses the Anaheim Mighty ducks hockey team. With all the different overseas made flanges and fittings, the air handler headers leaked like sprinkler systems using regular teflon tape and keytite.