The diameter from outside to outside is 5-1/4 inches, and the inside opening is 4 inches diameter for the Camco RV Replacement Plumbing Vent w/ Putty and Screws - Polar White # CAM40033.
It will fit 1" to 2-3/8" pipe and comes with 6 mounting screws. The mounting holes of the # CAM40033 are 2-3/8 inches apart on center. There is not a coupler to extend the pipe height. view full answer...
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