These days, most drains are made with PVC or ABS plastic. Plastic drain fittings are usually glued, but the ones you might need to remove temporarily, like cleanout plugs, are threaded.

PVC Pipe Fittings Just For Building Stuff. 50 Comments . by: Mike Szczys. September 10, 2010. ... What we really need is someone who will make threaded PVC fittings (UV resistant) ...

Westlake’s NAPCO Pipe & Fittings Introduces High-Performance Molecular-Oriented PVC C909 Pipe New PVC Pipe Features Higher Performance and a Lower Carbon Footprint Than Past Products December 08 ...

PPI PIPE’s accomplishment underscores their commitment to exceeding standard testing requirements for PFAS in PVC pipes and fittings, ultimately contributing to the advancement of safer drinking ...