Backer Rod for Gaps and Joints, Black Rubber Caulk Saver Weather Stripping Concrete Filler Rope (6mm Diameter x 3m Length)

Sealing a window, worked well.

Bought to fill gaps around a window left after poor fitting/installation.Easy to use and has reduced the draft (and noise) that was previously leaking through the gaps.

Good for sealing gutter joints

Fitted pretty perfectly even down to 3mm gaps for me. Bye bye draught

easy to use and flexible to fill gaps

Did the job for me.

Massively overpriced for a piece of rubber

I used them to push inside the rubber seals on a saab convertable roof to window seal, this reactivated the seal stopping wind noise and water leaks.