Lens ring gaskets are normally pressure assisted (the higher the pressure the better the seal)and the same ID or close to the pipe ID. Ring gaskets, even if pressure assisted such as an RX or GX, tend to lose efficiency as the pressure increases and the flanges are forced apart. One of the best known lens ring gaskets is the Grayloc http://www.grayloc.com/ although there are plenty of other designs available.

Dear All,

Is there a significant matter if the end user requirement is lens ring joint but we still insist use the integral flange.

rgds,
Anung

You're talking apples and oranges, you can have a lens ring gasket with an integral flange. But in general if the end user has a requirement for one thing and you're supplying something else then I would say you have a significant problem.