Based on this product's specifications, here are some alternatives and similar models
Window Pass-Through LIBOX LB0099 — LIBOX LB0099 window access panel
Summary description:
LIBOX LB0099 is a window pass-through designed to provide a sealed access point in a window or wall. Intended for transferring small items or for pet access, it offers a compact opening solution that installs into an existing window frame or wall aperture. The unit focuses on practical access and basic weather separation; suitable for homes, small businesses or service points requiring a simple window access panel.