What is LEAST true regarding drainage pipe fittings?

Drainage pipe fittings serve distinct functions and are designed differently compared to water supply fittings. They are specifically intended to manage the flow of wastewater and sewage, which involves considerations such as gravity flow and venting rather than the high pressure associated with water supply lines.

The statement regarding them being the same as water supply fittings is the least true because drainage fittings are typically designed to accommodate lower pressure scenarios, primarily focusing on the effective removal of waste. While water supply fittings must withstand higher pressures to deliver potable water safely, drainage systems operate under less pressure, relying on gravity to transport waste.

Additionally, drainage fittings are made from various materials, such as PVC, ABS, and cast iron, which can differ from those used for water supply fittings, which might include copper or PEX. The installation techniques also vary, as drainage systems often require considerations for slope and venting that are not present in water supply installations.