What are the different types of materials used in plumbing fittings, and how does an ABS to PVC coupling facilitate the connection between these two materials?

Plumbing fittings can be made from various materials such as copper, brass, PVC, and ABS. An ABS to PVC coupling is a fitting specifically designed to connect ABS (a type of plastic) pipes to PVC (another type of plastic) pipes. This coupling has two different ends, one that fits onto the ABS pipe and another that fits onto the PVC pipe, allowing for a secure and watertight connection between the two different materials.