InoxPRES 304L
https://www.racmet.com/en-ww/inoxpres-304l.aspx
The fittings feature an 'M profile' toroidal chamber, optimised based on Raccorderie Metalliche's expertise, in which an O-Ring developed by Raccorderie Metalliche is directly mounted at the factory.... A range of reliable fittings featuring an O-Ring developed by Raccorderie Metalliche, the result of a patented innovation. ... [...]

Pressfitting systems in stainless steel, inoxPRES / Stainless steel
https://www.racmet.com/en-ww/inoxpres.aspx
The fittings feature an 'M profile' toroidal chamber, optimised based on Raccorderie Metalliche's expertise, in which an O-Ring developed by Raccorderie Metalliche is directly mounted at the factory. This O-Ring is the result of patented innovation. ... A range of reliable fittings featuring an O-Ring developed by Raccorderie [...]

Inoxpres UNIKO 304L
https://www.racmet.com/en-ww/inoxpres-uniko-304l.aspx
The fittings feature a toroidal chamber with an 'UNIKO profile', optimised based on Raccorderie Metalliche's experience, which comes factory-fitted with an O-Ring developed by Raccorderie Metalliche, the result of patented innovation. ... A range of reliable fittings featuring an O-Ring developed by Raccorderie Metalliche, the result of a [...]

pressfitting systems, Pressfittings
https://www.racmet.com/en-ww/pressfittings.aspx
Pressing permanently deforms the fitting on the pipe thus leading to a perfect mechanical joint, while the O-Ring provides for the hydraulic tightening connection. ... No need to prepare the fittings, with hemp or Teflon as any joint comes with factory mounts O-Rings.

aesPRES UNIKO
https://www.racmet.com/en-ww/aespres-uniko-v1.aspx
The fittings feature a toroidal chamber with a “UNIKO profile” optimized based on Raccorderie Metalliche’s experience, inside which an O-Ring developed by Raccorderie Metalliche is factory-installed, resulting from a patented innovation. ... A range of reliable fittings featuring an O-Ring developed by Raccorderie Metalliche, the result of [...]

press tools and accessories, Tooling
https://www.racmet.com/en-ww/tooling.aspx
  The hydraulic tightness is provided by the presence of the patented lenticular O-ring inside each joint.

Sealing Ring
https://www.racmet.com/en-ww/sealing-ring.aspx
Communication > Glossary > Sealing Ring Sealing Ring O-Ring; patented lens-shaped seal, which adheres perfectly to the toroidal chamber.

O-ring
https://www.racmet.com/en-ww/o-ring.aspx
Communication > Glossary > O-ring O-ring Oring; OR; patented lens-shaped sealing ring placed at the bulging edges of pressfitting fittings. Different O-Rings are available according to the type of application (EPDM, STEAM, HT, FKM, NBR-HNBR,MVQ)

Which O-Rings are currently available?
https://www.racmet.com/en-ww/which-o-rings-are-currently-available.aspx
Communication > The expert answers > Which O-Rings are currently available? Which O-Rings are currently available? The O-Rings currently available are: EPDM (ethylene-propylene diene polymer) O-Rings usually assembled on pressfitting joints; NBR (nitrile rubber) O-Rings; FKM (fluorocarbon rubber) [...]

Which O-Rings are required for solar installations?
https://www.racmet.com/en-ww/which-o-rings-are-required-for-solar-installations.aspx
Communication > The expert answers > Which O-Rings are required for solar installations? Which O-Rings are required for solar installations? FKM (fluorocarbon rubber) O-Rings have suitable characteristics for solar panel installations.