What type of fitting can a residential dishwasher connect to via its waste connection?

A residential dishwasher typically connects to the drainage system through a waste connection, which is best accomplished using a wye branch fitting. This type of fitting allows for the proper drainage and venting of waste water from the dishwasher into the main drain line without causing clogs or backflow issues. The wye branch design helps to facilitate a smooth flow of water by providing a gradual change in direction, which reduces friction and enhances drainage efficiency.

In addition, using a wye branch fitting is advantageous because it allows for the incorporation of additional branches off the main drain line if needed, adhering to plumbing best practices. This is particularly important in residential plumbing where multiple appliances may need to connect to the same waste line.

The other types of fittings, while useful in different plumbing contexts, do not serve this specific purpose as effectively. A tee fitting, for instance, could create sharp angles that may hinder drainage flow. Elbow fittings are primarily used for turning lines but do not support multiple connections as wye fittings do. Couplings are designed to connect two straight sections of pipe but do not provide branching capability.