From the Loftsmith community

Letterbox cover with flap

Gives a letterbox opening a proper flap, so post goes in and the draught doesn't. A dark hinged cover sits in a frame with a small hinge at each end and a pair of screw holes on the face. Change the slot width and height to match your own opening.

2 parts · 67 g · 242 × 14 × 78 mm