Spread an even layer of solvent PVC cement on the inside of the fitting and ... especially if you can't thread on an adapter. Each coupling is labeled with all the different types and sizes ...

Speed and accuracy count when gluing PVC pipe. This guide will help you avoid mishaps when making airtight connections with ...

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.