• Profile view of the D456S12 bulb seal fitted on 4-6mm glass, illustrating the transparent U-channel grip and the elongated soft bulb designed to bridge wide gaps up to 12mm in bottom or side applications.
  • Technical dimension diagram of the D456S12 strip, specifying the 4-6mm inner channel range and the extended bulb height intended to accommodate gap variations between 8mm and 12mm for diverse sealing needs
  • Macro close-up of the D456S12 transparent bulb, highlighting the smooth, high-gloss surface and the robust material structure capable of significant compression without losing shape integrity.
  • High-resolution detail of the D456S12 U-channel body, showcasing consistent wall thickness engineered to support the extended bulb load on 4-6mm glass panels, combined with optical clarity.
  • Application view of the D456S12 seals installed on two adjacent glass panels with a wide spacing, demonstrating how the soft bulbs compress to fill gaps up to 12mm, suitable for double-door configurations with significant alignment variances.
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4-6mm Glass Bulb Seals Large Gaps 8-12mm D456S12

£14.88
£21.00 £14.88
Sold out
-29%
Taxes included. Shipping calculated at checkout.
Total Length: 950mm
Gap: Seal 12mm

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Description

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Technical Specifications

Catalog No: D456S12
Glass Thickness: 4mm, 5mm & 6mm
Gap Suitability: 8mm to 12mm (Wide Void)
Installation: Push-fit (No adhesives)
Length: 950mm / 2000mm (Trimmable)
Material: UV-stabilised Clear PVC
Profile: Large Hollow Bulb

✓ 10-Month Warranty | ✓ 30-Day Returns | ✓ Free UK Shipping / VAT Inc.

Detailed Description

A Professional Solution for Non-Standard Gaps
The D456S12 is developed to address wider voids (8-12mm) that standard seals often fail to reach. Whether due to structural settling in period properties or slight misalignments during installation, this high-tolerance profile provides a reliable watertight barrier by bridging excessive spacing with its extended compression range.
Exceptional Resilience & Shape Retention
Crafted from eco-friendly, virgin medical-grade PVC, the 12mm bulb is engineered for superior recovery. Its large-diameter geometry maintains consistent tension across wider spans and is designed to endure thousands of compression cycles without the permanent flattening often seen in lower-grade recycled materials.
Adaptive Sealing for Out-of-Plumb Walls
The flexible U-channel offers a secure, friction-based grip on narrower glass widths, while the oversized bulb adapts to inconsistent gaps. If your enclosure tapers from top to bottom, the D456S12 compensates for these irregularities, providing a soft, cushioned contact point without hindering the door's operation.
Clarity Maintenance in UK Environments
To manage the challenges of UK hard water, our PVC is enhanced with UV stabilisers to help delay discolouration. As large-diameter seals feature a significant internal cavity, we suggest ensuring adequate ventilation after use to help keep the hollow core dry and reduce the rate of mould development.

Frequently Asked Questions

Is this model thicker than standard bubble seals?
Yes. While it fits the same 4-6mm glass, the "bubble" portion is significantly more substantial than the standard D456S7. It is specifically intended for wider gaps; for clearances under 7mm, we recommend the D456S7 to ensure the most comfortable closing force.
Is it suitable for pivot, sliding, or bifold configurations?
Extremely so. The compressible nature of the 12mm bulb offers greater tolerance than traditional fin seals. It provides an aesthetically clean and quiet buffer at pivot points where glass panels meet, without hindering the door's natural swing.
How do I ensure a precision fit?
The high-purity PVC is formulated for easy customisation. It can be precision-trimmed with a sharp utility knife or heavy-duty shears to match the specific height of your enclosure, ensuring the seal sits flush against the threshold.

Delivery & Shipping Information

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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

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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

View full details
Profile view of the D456S12 bulb seal fitted on 4-6mm glass, illustrating the transparent U-channel grip and the elongated soft bulb designed to bridge wide gaps up to 12mm in bottom or side applications.
4-6mm Glass Bulb Seals Large Gaps..
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Simba Professional Care Guide

Ensure a perfect fit and a lifetime of clarity.

4-6mm Glass Bulb Seals Large Gaps 8-12mm D456S12 Installation Guide - Simba Anti-Mould Shower Seal

✓ 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 Quality Management

ISO 9001:2015

Premium quality control ensuring consistent product durability and precision fit.

ISO 14001:2015 Eco-Friendly

ISO 14001:2015

Manufactured with a commitment to environmental responsibility and eco-friendly processes.

SVHC REACH Compliant

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.

SIMBA shower screen seal, Premium Clarity. Flawless Fit.

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!

Need guide installing this seal?

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.