Based on this product's specifications, here are some alternatives and similar models
End Cap Lightwin 12mm Gas Stop Single Pull Seal for 3–6mm FTTx Cable
Summary description:
End cap by Lightwin for FTTx installations, 12 mm inlet with gas stop and single-pull seal designed for cable diameters 3–6 mm. Provides a sealed termination to prevent gas and moisture ingress, supports easy single-pull installation and protects fiber closures and outdoor splices. Suitable for aerial and duct cable entries in residential and commercial networks.