Based on this product's specifications, here are some alternatives and similar models
Nozzle assembly Flashforge C4 HT 0.4mm V2 — 3D printer hotend nozzle, 0.4 mm aperture
Summary description:
Replacement nozzle assembly for Flashforge C4 HT 0.4mm V2. Designed for use with compatible Flashforge hotend systems, this 0.4 mm nozzle provides a defined extrusion aperture for precise filament flow. Suitable for standard 3D printing tasks, it helps maintain print quality after wear or clogging and enables consistent layer deposition for functional parts and prototypes.