Based on this product's specifications, here are some alternatives and similar models
Lapp SKINDICHT BL-M Hexagonal Blanking Plug M20 x 1.5 Brass Nickel-Plated
Summary description:
The Lapp SKINDICHT BL-M is a high-quality hexagonal blanking plug designed for sealing unused threaded holes in electrical enclosures and housings. Made from durable nickel-plated brass, this M20 x 1.5 plug ensures reliable protection and IP68 ingress protection. This pack contains 50 pieces, making it an ideal solution for industrial electrical installations requiring secure and robust cable entry management.