Magflap® MK3 Horizontal Letterbox Draught Excluder - Stop Draughts, Noise & Heat Loss with Magnetic Seal Technology Additional Gasket - Allows for 18mm of nut or bolt clearance.:Yes The Magflap MK3's airtight magnetic

The Magflap MK3's airtight magnetic seal prevents this heat loss

Adjust screw tightness if binding occurs

Q: Is this suitable for external door mounting

The powder-coated steel and sealed pivot mechanism withstand UK weather

Magflap® MK3 Horizontal Letterbox Draught Excluder - Stop Draughts, Noise & Heat Loss with Magnetic Seal Technology Additional Gasket - Allows for 18mm of nut or bolt clearance.:Yes The Magflap MK3's airtight magneticStop Letterbox Draughts, Noise & Heat Loss Forever Your letterbox is the largest uninsulated hole in your front door. The Magflap MK3 Horizontal is a premium internal letterbox draught excluder that uses precision engineered magnetic seal technology to eliminate draughts, reduce noise, prevent dust infiltration, and improve your home's thermal efficiency. Unlike traditional brush based letterbox seals that wear out and leave gaps, the Magflap MK3's