This magnet is compatible with the following Staywell cat flaps Staywell 16 – Staywell 17 – Staywell 18 – Staywell 19 – Staywell 20 – Staywell 21 – Staywell 22 – Staywell 30 – Staywell 31 – Staywell 32 – Staywell 917 – Staywell 919 – Staywell 932 Staywell – 916 Staywell – 918