Based on this product's specifications, here are some alternatives and similar models
Nozzle assembly for Flashforge AD3/4, 0.6 mm orifice, rated up to 265°C
Summary description:
Replacement nozzle assembly compatible with Flashforge AD3/4 models. Features a 0.6 mm nozzle orifice and is specified for use at temperatures up to 265°C. Designed for filament extrusion in FDM 3D printing, it supports medium-diameter prints and materials within the stated temperature range. Suitable for maintenance, part replacement, and restoring print quality.