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I work for a company that does environmental compliance for gas stations. Some of the pipe we work with is 4". When installed, sometimes it is torqued way beyond requirements and we cant get it with a chain wrench and cheater using 2 people. We cant use a traditional or off set wrench, because its in a 10 inch wide hole, and we cannot damage the threads.
No one I know of makes an internal 4" wrench, and it would probably not be functional if they did.
What I have used in my underground tank applications is an adjustable 3/4" drive chain wrench available from McMaster-Carr. This will require both the wrench, a 3/4" drive ratchet (although I would suggest a breaker bar), and a 3/4" drive extention.