These days, most drains are made with PVC or ABS plastic. Plastic drain fittings are usually glued, but the ones you might ...

The threaded end of the fitting is secured with a lock ... Other materials available for use as conduit fittings include aluminum, fiberglass, PVC, PVC coated aluminum or steel, nylon, polyester, ...

These types of fittings have a reverse thread; meaning, the threads are cut in the reverse direction from all other fittings so that gas lines cannot be connected to air lines, water lines, or vent ...