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Bell and spigot pipes are designed with specific joint types that facilitate their assembly and ensure a proper seal. The most commonly used joints for connecting bell and spigot pipes are mechanical joints. These joints consist of a bell end that has an internal groove and a spigot end that fits snugly into the bell. A gasket is typically used to create a watertight seal, and often a mechanical device is employed to tighten the connection, ensuring stability and preventing leaks.

Mechanical joints are favored in many applications due to their ease of installation and the ability to provide a secure connection that can still allow for a certain degree of flexibility. This flexibility is important because it accommodates slight movements caused by thermal expansion and contraction, as well as ground shifts.

In contrast, other joint types such as flange joints are typically used in different contexts where a flat surface is available for bolting together, which might not be practical for bell and spigot pipes. Restrained joints are utilized in specific scenarios where additional strength and stability are required, while flexible joints provide movement but are not the standard type used for this particular pipe configuration. Hence, mechanical joints stand out as the principal choice for connecting bell and spigot pipes due to their design and performance characteristics.