Based on this product's specifications, here are some alternatives and similar models
UN inspection chamber cover 300×300 mm PVC A15 brown
Summary description:
PVC inspection chamber cover by UN, size 300×300 mm, load class A15 and brown finish. Designed for light pedestrian and bicycle areas, this durable cover fits standard 300×300 inspection openings and provides basic protection and access to underground utilities. Suitable for residential paths, gardens, and light traffic zones where a compact, low-profile access cover is required.