Based on this product's specifications, here are some alternatives and similar models
Inlet Nozzle for sera UVC-Xtreme 1200 (2 pcs) – replacement inlet fitting for aquarium sterilizer
Summary description:
Replacement inlet nozzle set (2 pieces) for the sera UVC-Xtreme 1200 aquarium UVC sterilizer. Designed to fit the specified sera UVC unit, these inlet fittings serve as original spare parts for connecting the sterilizer to aquarium plumbing and ensuring proper water flow through the UVC chamber. Suitable for maintenance and repairs of the UVC-Xtreme 1200.