Based on this product's specifications, here are some alternatives and similar models
Access door AWENTA DMN60 stainless steel 25×25 cm inspection panel
Summary description:
Stainless steel inspection/access door AWENTA DMN60 with outer dimensions 25×25 cm. Designed for installation in walls or service panels to provide access to concealed plumbing, ductwork, valves and fittings. Features a flush-mounted frame and removable panel for maintenance and inspection. Suitable for residential and commercial service openings where corrosion resistance is required.