What type of joint allows moderate deflection with vibration absorption and pipe movement?

The correct answer is a Dresser Coupling because this type of joint is specifically designed to accommodate pipe movement and moderate deflection, making it ideal for applications where vibration absorption is necessary. Dresser Couplings consist of a flexible design that uses rubber gaskets or seals to connect pipes, allowing for some degree of freedom in positioning. This flexibility helps to absorb vibrations that may occur due to water flow, pressure changes, or external disturbances, thereby enhancing the longevity and integrity of the piping system.

In contrast, other types of joints, such as a rigid joint, do not allow for movement or deflection, which makes them unsuitable for situations where pipes experience shifting or vibration. Similarly, standard pipe couplings do not have the features necessary to absorb vibrations effectively, and threaded joints can be subject to loosening and leakage issues, especially under dynamic conditions. Thus, for applications requiring flexibility, vibration absorption, and the capability to handle pipe movement, Dresser Coupling stands out as the most appropriate choice.