Which fitting uses a stainless steel band and gasket to help stop leaks?

The fitting that employs a stainless steel band and gasket to help stop leaks is a clamp. Clamps are commonly used in plumbing and pipe systems as they provide a secure hold to connect or hold two sections of a pipe together, while effectively preventing leaks. The stainless steel band creates a strong, rust-resistant connection that can withstand pressure, while the gasket ensures that the seal is tight enough to minimize any leakage.

In contrast, couplings are typically used to join two pipes directly without a gasket but rely on a fitting surface that may not be as effective against leaks as a clamp with a gasket. Elbows are used to change the direction of the pipe but do not have features designed specifically for leak prevention in the same way. Hex fittings serve as connectors with internal threads but are not equipped with the leakage prevention components of a clamp. Therefore, the clamp stands out for its specifically designed features that address leak issues efficiently.