When the gasket is static, it grab the end surface of the pipe to form a primary seal.
When the clamp is locked, the gasket is passively pressed at the end of the pipeline to form a secondary seal due to the pressure from the internal limit of the clamp.
The fluid in the pipe enters the "C" ring cavity and reacts on the gasket lip, so that the gasket lip fits closely with the end of the pipe without any clearance, forming a triple seal.
