# AFNOR outlet (NF S90-116)

An AFNOR outlet is a medical gas terminal unit built to the French standard NF S90-116, which defines for each gas the notched quick-connect system between the socket and the end fitting of the medical device.

NF S90-116 is published by AFNOR, the French standards body. AFNOR lists the October 2020 edition, of 18 pages, as current; it replaced the June 1988 edition, now cancelled. The standard requires the socket to meet NF EN ISO 9170-1, sets the maximum permissible leakage of the connection and the strength of the mounting, and specifies the marking for each gas.

ISO 9170-1, the international standard for [terminal units](https://library.ultracontrolo.com/glossary/terminal-unit/), makes outlets gas-specific but leaves the dimensions of [probes](https://library.ultracontrolo.com/glossary/gas-specific-probe/) to regional or national standards. The World Health Organization lists the French NF S90-116 style next to the German DIN 13260-2 and British BS 5682 styles, among others, and notes that each style uses key-like indexing so that the fittings of each gas service connect only with their own type.

For pipeline design in France, AFNOR lists FD S90-155 (November 2024 edition) as current: additional elements for the design and delivery acceptance of pipelines for compressed medical gases and vacuum.

## Sources

- [AFNOR, NF S90-116 (October 2020), Sockets and related probes for medical fluids, store page](https://www.boutique.afnor.org/en-gb/standard/nf-s90116/medical-gas-pipeline-distribution-systems-sockets-and-related-probes-for-me/fa191757/260496)
- [ISO 9170-1:2017, Terminal units for medical gas pipeline systems (ISO summary)](https://www.iso.org/standard/67451.html)
- [WHO, Foundations of medical oxygen systems (2023), outlet connector styles](https://iris.who.int/server/api/core/bitstreams/4ad6f5fd-089e-4142-8439-b64e98d816d8/content)
- [AFNOR, FD S90-155 (November 2024), store page](https://www.boutique.afnor.org/en-gb/standard/fd-s90155/pipeline-for-compressed-medical-gases-and-vacuum-additional-elements-for-de/fa210096/427133)

Reviewed: 2026-10-22. Ultra Controlo engineering. https://library.ultracontrolo.com/glossary/afnor-outlet/