Based on this product's specifications, here are some alternatives and similar models
Plaster Cup KWB 179400 — accessory for plastering tools, model 179400 by KWB
Summary description:
KWB 179400 plaster cup is an accessory designed for use with plastering and tiling tools. It serves as a container for mixing or holding plaster, adhesives or similar compounds during application. Compact and practical, it helps organize materials on site, supports efficient workflow and reduces waste when preparing small batches for repair, renovation or finishing tasks.