Inoxpres Gas
https://www.racmet.com/en-ww/inoxpres-gas-v1.aspx
The Gas line is different from the standard line because of the yellow marking on fittings and the presence of the yellow NBR/HNBR O-Ring in the toroidal chamber.

What do you mean by homologated pressfitting system?, The expert answers
https://www.racmet.com/en-ww/what-do-you-mean-by-homologated-pressfitting-system.aspx
Pressfitting system is composed of pipes, joints with the related O-Rings, and the pressing equipment used to obtain such permanent junction.

Cupronickel Joints. Which are the fields of application?, The expert answers
https://www.racmet.com/en-ww/cupronickel-joints-which-are-the-fields-of-application.aspx
The mounted green FKM O-rings can be used between -20/+220°C, maximum pressure 16bar, providing for quality and safety as well Find out more  

Bronze Joints. Which are the fields of application?, The expert answers
https://www.racmet.com/en-ww/bronze-joints-which-are-the-fields-of-application.aspx
The mounted O-Rings can be used at different temperatures, -20 to +120 °C, maximum pressure 16bar providing for quality and safety as well.

Pressfitting systems for Compressed Air Installations, LAB
https://www.racmet.com/en-ww/pressfitting-systems-for-compressed-air-installations.aspx
Depending on the residual oil present in the compressed air lines, it will be necessary to check that the EPDM O-Ring is suitable, or if necessary, replace it with the FKM O-Ring. For example, for compressed air in class 5, with an oil content that is higher than 5 MG/M3, it is recommended to use the FMK [...]

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.

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 [...]

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 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 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 [...]