Sewer pipe?

Other thread you mentioned black so its ABS. Available just about any hardware store, big box store etc. ((ABS dwv pipe sizes). T/C generaly 1 1/2" on the gray water lines, (though a few use less common 1 1/4"), and 3" on the black water. Typically SCH 40 used and what youll find in off the shelf 'sewer' ABS pipe & fittings.
Lowes I believe sells pipe in less than 10' lengths.

ABS on mine

The black ABS seems to be more common and durable.

If it's black it's ABS if it's white it's PVC. The one's I've seen have been ABS.