Wheelock MPS-ISB Interior Surface Backbox

The Wheelock MPS-ISB backbox is an interior surface-mount backbox for Wheelock MPS manual pull stations, providing a clean, surface-mounted installation on a single-gang footprint. It’s finished in red to match MPS stations and is sized for consistent mounting depth and alignment. Key Specifications: Type: Interior surface-mount backbox Core Function(s): Provides surface-mount backbox for compatible Wheelock MPS manual pull stations Finish: Red Mounting: Single-gang backbox application (surface mount) Dimensions: 4-3/4 in H × 3-1/4 in W × 2-1/4 in D Compatible Devices: MPS-100 – Single-action manual pull station MPS-200 – Dual-action manual pull station System Compatibility: Compatible with Wheelock MPS Series manual pull stations. Alternate Part Number: 8404