Based on this product's specifications, here are some alternatives and similar models
End Caps for Micro Tubes Lightwin EN 7-20mm DC 12MM — protective end caps for 7–20 mm tubes
Summary description:
Protective end caps for micro tubes by Lightwin, model EN 7-20mm DC 12MM. Designed to fit tube diameters from 7 to 20 mm, these end caps provide a secure closure to protect tube ends from dust, moisture and mechanical damage. Suitable for micro tubing in electrical, lighting and small-scale plumbing or assembly applications where neat finishes and protection are required.