Raccorderie Metalliche and cooling plants
https://www.racmet.com/en-ww/cooling-plants.aspx
  steelPRES fittings are pre-fitted EPDM O-Rings, a compound providing for the best possible performances:  PM16 maximum pressure, temperature ranging between -20/+120° C and quality in time. ... All inoxPRES fittings are pre-fitted EPDM O-Ring,  developed to be used  providing for the highest [...]

Raccorderie Metalliche and heating plants
https://www.racmet.com/en-ww/heating-plants.aspx
  steelPRES fittings are pre-fitted EPDM O-Rings, a compound providing for the best possible performances:  PM16 maximum pressure, temperature ranging between -20/+120° C and quality in time. ... All inoxPRES fittings are pre-fitted EPDM O-Ring,  developed to be used  providing for the highest [...]

How to install Pressfitting 76-108 mm, Events and News, Raccorderie Metalliche
https://www.racmet.com/en-ww/how-to-install-pressfitting-76-108-mm.aspx
  The hydraulic seal is guaranteed by the O-ring deformed in its section: thanks to its elasticity, it guarantees the joint's permanent tightness.

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.

Services
https://www.racmet.com/en-ww/the-services.aspx
Our patents The company constantly committed to develop original and innovating solutions. 4 patents for press systems:   O-Ring for pressfitting Drop O-Ring Hydro-shaped Ts Pressfitting instrumented fittings 2 patents for clamps and fitting systems:    Dowel screw or latching screw Vessel and bidet supporting [...]

Pressfitting systems for Potable Water Installations, LAB
https://www.racmet.com/en-ww/pressfitting-systems-for-potable-water-installations.aspx
Both systems are equipped with a patented lenticular O-Ring in EPDM suitable for the conveyance of drinking water that meets all the requirements of the certification entities and passed the strict hygiene tests.

Pressfitting systems for Gas Distribution Installations, LAB
https://www.racmet.com/en-ww/pressfitting-systems-for-gas-distribution-installations.aspx
In compliance with the regulations, all fittings in the 4 ranges of Raccorderie Metalliche are externally marked in yellow and they are equipped with a specific yellow O-Ring.

The complete range of inoxPRES pipes and fittings at the famous brewery in Latvia, Our stories
https://www.racmet.com/en-ww/the-complete-range-of-inoxpres-pipes-and-fittings-at-the-famous-brewery-in-latvia.aspx
All ranges of metal fittings are also fitted with special O-Rings, with a patented profile, which ensure resistance to temperatures between -20 °C and +120 °C and a maximum pressure PN16.

Raccorderie Metalliche wins the Best Stand of 2019, Events and News, Raccorderie Metalliche
https://www.racmet.com/en-ww/raccorderie-metalliche-wins-the-best-stand-of-2019.aspx
"The component identified in most of the answers was the O-ring.

Pressfitting systems for Solar Thermal Installations, LAB
https://www.racmet.com/en-ww/pressfitting-systems-for-solar-thermal-installations.aspx
The pipes connecting the solar panels and the sanitary water system are generally made of three types of materials: - carbon steel (for the primary circuit) - copper or stainless steel (for both the primary and secondary circuits) Raccorderie Metalliche produces three pressfitting systems with these materials: - steelPRES system (in carbon steel) - aesPRES system (in copper) - inoxPRES [...]