Gasket over-compression because of pipe mis-alignments is one of the most common problems we see on a daily base. The flanges are not parallel and therefore we squeeze the gaskets until it stops leaking. The result is a completely destroyed gasket. The above illustration shows how the red plastic ring prevents over compression of the elastomer. Even if we give it the extra torque above the recommended levels, the gasket is fully protected.
Click on the above photo for more details
Over-compression made possible
The Snap-On™ gasket has been designed to be "abused" in terms of compression. The Red plastic ring will protect the elastomer gasket material from destruction.
No matter how hard you torque the clamp because of possible alignment issues, the gasket will still function.
Observe the video below to see how it works.