KB3D NEXUS - The modular Gas Mask system: N40 Module (Patreon)

The third module in the KB3D Modular Gasmask System refresh/standardisation. This modular system is now called NEXUS.

The Nexus is The Modular Gas Mask System. Built around a universal interface—dubbed The Insert—each module screws securely into the mask’s insert, allowing the function to be changed as required. The Insert is not included in this post.

This post contains the N40 Module. The N40 module is Nato40 and valve combined into 1. This allows an umbrella valve to act as an inlet or outlet, in addition to providing a NATO40 connection on the front.

Available masks:

S10/FMJ-08 - Compatible

FM12 - No current compatible module

MF11/FMJ05 - Compatible

GP5 - Only compatible with GP5 rebreather module - not compatible with the umbrella valve.

Last updated: June 2026