https://www.sentryinterlocks.com/product/ez-modlock-2-door-expansion/
EZ ModLock 2-Door Expansion Module | Add Up to 4 Doors
May 14, 2026 - Expand your EZ ModLock 2-Door system to control up to 4 doors. Compatible with fail safe and fail secure electric locks. Easy daisy-chain connection.
add up toexpansion moduleezdoor