Based on this product's specifications, here are some alternatives and similar models
Marmat ZL 40x40 Electrical Trunking End Cap, White
Summary description:
The Marmat ZL 40x40 end cap is a functional accessory designed for 40x40 mm electrical trunking systems. It provides a clean, professional finish to cable management installations, protecting cable ends and preventing dust accumulation. Made from durable white plastic, this component ensures a secure fit and aesthetic integration into residential or commercial wiring projects.