4inch lock nut

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ghbtwo

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I'm trying to replace the flushing system on one of our toilets but the old system has a 4inch diameter locking nut on the bottom of the tank. The adjustable plumbers wrenches I've been able to find have a 3" max mouth opening. Would anyone be able to suggest a reasonably priced wrench make/model or link? Thanks in advance!
 
thanks for the idea, didn't think of that. much appreciated.
 
Don’t know the brand, I just posted that link for an example.
But it should be fine for this task, and Amazon is good on returns.

Harbor Freight has cheap ones also.

A genuine Channellock that size is probably around $30.00.
 

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