This document defines the design, safety and operational characteristics of connectors for refuelling hydrogen gas into ground vehicles. This document divides refuelling connectors into the following three basic parts:

- Pressure and protective cover (vehicle mounted).

- Nozzle

- Communication device (communication between the filled vehicle and the HFS)

This document is intended for filling connections with a nominal working pressure up to 70 MPa.

The design and types of filling connections are dealt with in a separate section of the module.