Based on this product's specifications, here are some alternatives and similar models
Drain syphon for BWT water softener P0074702 – wastewater discharge accessory
Summary description:
Drain syphon designed for BWT water softener model P0074702. Intended to collect and discharge backwash and wastewater from the softening unit, it serves as a plumbing accessory for proper drainage and connection to household waste system. Suitable for installation where controlled removal of regeneration effluent is required.