@Commander Iam looking for the NP Max cartridge holder files for the NovoPen 4. Just to clarify, I’m not looking for the small adapter or coupler, but rather the complete cartridge holder that allows the NovoPen 4 to accept a standard 3 mL cartridge. If you could set me in the right direction…. If you could actually share the latest update I would appreciate it and to show my application I can send you a new Novopen4 and some PenVault swag.