I live in Oklahoma and am going to be servicing a 40 gallon water heater tomorrow. Well replacing it. Right now it has 4inch single wall ran over bout three feet to the heating unit and taps into a 4x5 singlewall tee. On top if that tee is double wall. Since I have to raise the water heater I am going to have to raise the tee as well. Of course 4inch is to big but can I run three inch singlewall over to the new t and it be legal? Thanks for the input!
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