I had a hole in a bathroom drain pipe and am replacing a 4 foot section of the pipe. I got a 3 inch no hub coupling and am attaching it to the new pipe and section of old pipe that is still in place. But when I put the coupling over the section of old pipe it is rather loose. While when I put it on the new pipe it fits very snug. I'm not sure if this is a problem. When I tighten the clamp maybe it won't make a difference. Both sections of pipe are supposedly 3 inch. One is 18 years old the other is brand new. Here is a picute of a coupling like the one I am using:
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