Based on this product's specifications, here are some alternatives and similar models
Cellpack E312AA-YY029 Heat Shrink Cable Joint for 1.5-16mm Wires
Summary description:
The Cellpack E312AA-YY029 is a high-quality heat shrink cable joint designed for reliable electrical connections. Suitable for wires with a cross-section of 1.5-16 mm, this connector ensures durable insulation and protection. Ideal for professional electrical installations, it provides a secure and moisture-resistant seal for cable repairs or extensions. The set includes 1 piece with a length of 400 mm.