Based on this product's specifications, here are some alternatives and similar models
Connector/cable seal Lightwin DC 8MM SEAL 2.1MM — assorted colours, cable Ø up to 2.1 mm, max water pressure 0.5 bar
Summary description:
Lightwin DC 8MM SEAL 2.1MM is a connector and cable sealing element designed for cables with a maximum diameter of 2.1 mm. Supplied in assorted colours, it provides protection against moisture up to 0.5 bar water pressure. Intended for sealing DC connectors and small cable entries in networking and low-voltage power applications to reduce ingress and improve reliability.