Fire hose to garden hose adapter

I made this Guillemin coupling to Gardena garden hose coupling adapter at work. This allows me to connect a garden hose with quick lock connector to a fire hydrant with what is apparently called a Guillemin connector.
This is a two part design which fits into each other. The outer part connects to the hydrant connector pressing the inner part to the connector. All you need is a small O-ring to seal of the gardena coupling.