ZT-G401R Basic Type
Basic construction type, inner and outer diameters are reinforced
with several piles of metal without filler to give greater stability
and better compression characteristics. - Suitable for tongue and
groove, male and female or grooved to flat face flange assemblies.

ZT-G401IR Inner Ring Type
Solid inner metal ring acts as a compression stopper. To prevent
accumulation of solids, reduce turbulent flow of process fluids
and minimize erosion, damages of gasket between flange bore and
the inside diameter, the annular space is filled up by solid inner
metal ring. - Suitable for male and female pipe flanges.

ZT-G401OR Outer Ring Type
Solid outer ring accurately locates the gasket on the flange face
to give the additional radial strength to prevent the gasket blowout
and acts as a compression limiter. In case of installing the outer
ring, it is very easy to install the gasket to flange face because
the end of outer ring will touch at bolts - Suitable for use with
flat face and raised face flanges. For class 900 and above an
internal ring is recommended.

ZT-G401IRO Inner & Outer Rings Type
A inner ring and outer ring type gasket will give an additional
compression limiting stopper for gasket inner and outer side. It
will prevent the corrosions on flange face at annular space. -
Suitable for use with flat face and raised face flanges and
specified for high pressure / temperature service - Class 900
and above or where corrosive or toxic media are present.