F Shape Shower Door Seal | 20mm Mid-Range Fin | Fits 4mm, 5mm & 6mm Glass F456S20
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Description
Description
The Large Gap Specialist: Professional Sealing for 23mm to 38mm Clearances
Supplied as:
1 x Twin Seal Pair (2 Units)
Specifically engineered to bridge significant gaps in 4mm-6mm slimline shower enclosures where standard seals fail.
Technical Specifications
| Catalog No. | F456S20 |
| Fin Length | 20mm (Reinforced Mid-Profile Fin) |
| Glass Compatibility | Fits 4mm, 5mm, or 6mm glass |
| Material | High-Grade Anti-Fungal PVC (REACH Certified) |
| Sealing Range | Bridges gaps between 23mm and 38mm |
| Standard Length | 2000mm (Easily trimmable at home) |
| Warranty & Shipping | 10-Month Guarantee | Free UK Shipping | VAT Inc. |
Is the F456S20 the Right Choice for Your Large Gap?
When your shower tray has settled or the original installer left a wide margin, a standard 12mm seal simply won't reach. The SIMBA F456S20 is our specialist 20mm profile, designed to bridge those wider-than-average gaps without losing its structural integrity.
Unlike 'universal' seals that lean and rattle on thin glass, this model features a narrowed U-channel designed to 'bite' onto 4mm, 5mm, and 6mm screens for a vertical, secure fit.
Specifically optimized for clearances between 23mm and 38mm. The 20mm reinforced fin provides enough 'flick' to seal tightly against the tray while remaining flexible enough for easy door operation.
This specialist part is a core component of our F shape shower door seals collection—the UK’s most reliable range for bespoke bathroom fixes.
Why Choose the SIMBA 20mm 'Slim-Fit' F Seal?
Specifically engineered for the lighter, thinner frames found in many modern UK homes that require extra reach.
Custom-moulded for thinner glass, ensuring the seal stays perfectly upright even with its extended 20mm fin length.
The rigid 'F' channel provides a high-tension fit on the glass edge. It stays put under daily use but remains easy to remove for cleaning.
Formulated with high-grade UV stabilisers to resist the yellowing effects of steam and sunlight.
Infused with anti-fungal agents to inhibit black mould growth in those hard-to-reach areas of your enclosure.
Delivery & Shipping Information
Delivery & Shipping Information
We aim to dispatch all orders placed before 2 PM on the same day. Orders placed after 2 PM usually ship the next working day.
Important: Our automated system selects the best courier based on your address, order size, and quantity.
Delivery Summary
- UK Mainland Standard: 2–3 working days (FREE).
- Highlands, Islands & NI: 3–7 working days (Calculated at checkout).
A small surcharge applies to remote areas (Highlands/Islands/NI). This is clearly calculated when you enter your postcode.
If your order hasn't arrived within 5 working days (any service), please email us immediately at info@showerdoorseal.uk.
Compliance Information
Compliance Information
Product Safety
Manufacturer Name: SIMBA International Limited
Address:No.25-2, Fuke North Road,
Luosong Village, Fusha Town,
Zhongshan, Guang Dong, China
Contact: support@glassseals.com
Notified by email when this product becomes available
£32.70
Simba Professional Care Guide
Ensure a perfect fit and a lifetime of clarity.
✓ DO’S
- Direct Press: Fit by pressing directly onto the glass edge to protect the surface.
- Deep Clean: Remove all UK hard-water limescale before installation.
- Sharp Tools: Use garden pruners for a clean, professional finish.
- Daily Rinse: Simply wash away soap suds after your shower.
✕ DON’TS
- No Sliding: Never slide the seal along the glass; this risks scratching.
- No Extreme Heat: Avoid water >70°C or hair dryers to prevent warping.
- No Soapy Water: Do not use lubricants—they accelerate mould growth.
- No Harsh Chemicals: Avoid bleach or acidic cleaners on the seal.
Quality & Environmental Standards
Simba® seals are manufactured to the highest international standards, ensuring safety and sustainability for your home.
ISO 9001:2015
Premium quality control ensuring consistent product durability and precision fit.
ISO 14001:2015
Manufactured with a commitment to environmental responsibility and eco-friendly processes.
SVHC / REACH
Certified non-toxic and safe for domestic use, free from harmful substances.
Installation & Maintenance Support
Unlike standard recycled strips, this profile is engineered with our signature UV-stabilised formula to prevent yellowing and brittleness.
Learn more about the science behind our High-Performance PVC Durability and why it outlasts high-street alternatives.
See why and how to Protect your seals from limescale.
Can’t Find the Right Seal?
As a leading manufacturer, SIMBA stocks over 9,000 styles. From vintage screens to modern doors, we’ve got you covered.
Stuck on which one to pick? Drop us a message. We’re here to help you get that perfect, water-tight fit!
We're the SIMBA makers, and we're always listening.
Since we design and make our own seals, we can actually do something about it.
If you spot anything that could be better—no matter how small—we’d genuinely love your feedback. Let’s make the next version perfect, together.
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