Maximum PSI rating is on the outside rating of the pipe
It should, are you sure your pvc pipe is round
Water flow rate half inch PVC pipe 65 psi?
Probably the wrong size flange. Is the flange a toilet collar? If so the pipe is probably 4 inch.
this depends on the class of the pipe as the higher the class the thicker the pipe
A standard water line PVC pipe typically has a width (diameter) of either 1/2 inch, 3/4 inch, 1 inch, or 1.5 inches.
1.5-inch by 440 feet of PVC pipe holds 40.4 gallons of water.
Most lumber yards should have it.
1 inch PVC pipe is about 47 cents a foot where I live in western Canada .
The price of PVC pipe varies from retailer to retailer. Home depot and Lowes sells most sizes for under three dollars a foot. 4 inch PVC pipe shouldn't cost more than $20 for a ten foot section.
Put an adapter between them. You can't transform it, you can replace it or change it at some point to 2 inch and continue with 2 inch.
3" Min - 4" is Max