GSR to NATO40 Converter (Patreon)

Have you just got your brand new GSR and found it frustrating it does not work with any of your old gas mask attachments. This replaces the valves on the side (very easy to remove) and allows you to use either GSR attachments or NATO40 Attachments.

The picture below has had both valves replaced and you can see it work with a NATO40 gas mask or GSR Attachment