I had two exhausts they needed to keep rodents out. Not sure about the sizing and return policies, I decided to explore Home Depot and my hardware store for everyday purchases. How come nobody knows what it is? I'm probably on the verge of insanity. I'm familiar with PVC pipes, but I was completely confused by the description of how to measure. They fit your plain 2", 3", 4" PVC elbow or collar pipe. The part of the pipe that goes out is the widest part. They fit together snugly with a simple touch. No glue required .I wouldn't recommend adding glue if you need to remove it.The only one I had was a 2" PVC collared pipe, so the 2" pipe I bought was the same diameter They picked up a plumber's hat and bought a collared PVC elbow pipe at a local hardware store and now I've got this part to put in. They're very well made and I recommend making a wire and clamp instead of a redneck, unless that's what it is kind you want.
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