Black Bifold Door Upright Seal - 4mm T-Head, Glass-to-Glass

What this seal is

A black vertical seal for the upright join of a bifold shower door, sealing glass-to-glass between the two panels as the door folds. It's made for black and matt-dark framed enclosures where a clear or white seal would jar — the black blade disappears against the frame.

Profile: a flexible 28mm-wide blade that bows into a smooth arch, carrying two 4mm T-heads (3mm stems, spaced 18mm apart) on its inner face. The T-heads slot into the vertical channels on the door uprights — no adhesive needed — and the arched blade flexes to close the gap between the panels as the door folds, so water stays inside the enclosure.

Specification

Why fit this seal

Stops the upright leak. The join between a bifold door's two panels is a common escape route for spray — a fresh upright seal closes it and keeps the water in.

Flexes with the fold. The arched blade spans the join and bends freely every time the door concertinas, springing back to seal when the door is closed.

Matches dark enclosures. On black and matt-dark frames a clear or white seal stands out; this black profile blends straight in.

No adhesive, no mess. The T-heads slide into the channels your door already has, and slide out again when it's next due a change.

Cuts with scissors. The soft PVC trims to your exact door height with ordinary household scissors.

Fitting in three steps

1. Measure. Check the vertical channels take a 4mm T-head and confirm you're sealing glass-to-glass on the upright.

2. Choose. Pick 1000mm or 2000mm — whichever is at or above your door height — or our custom cutting service.

3. Fit. Slide the old seal up and out, clean the channels, cut the new seal to height, then feed the T-heads in from the top and slide the seal down until seated.

Not sure it fits?

Email a photo of your old seal or your measurements to sales@industrial-polymers.co.uk and our UK team will confirm the right profile before you order — usually the same working day.