Main Wire Harness for PX-1 Main Cable for Model PX-1, Medium Power Pet™ door. Contains position sensing switches and power routing cables.Medium Power Pet Door Replacement Wire Harness No Need to Buy a New Unit Don't let your cherished pet be without the freedom of its Power Pet door if your out of warranty wire harness wears out. No need to buy a whole new Power Pet door unit if, for some reason, your wire harness fails. Just buy this replacement wire harness, and your Power Pet Door will be as good as new! Contains position sensing switchs and power routing cables in one easy to