• Close-up cross-section of the V456S20 shower door bottom gasket fitted on 4-6mm glass, showing the transparent U-channel, side guide rails, and extended 20mm single fin gripping standard thickness glass to cover wider gaps.
  • Technical dimension diagram for a 4-6mm glass bottom seal, detailing the inner channel width, 20mm central fin length, and overall profile height with lateral stabilising rails for precise replacement to solve floor gap issues.
  • Shower door bottom seal compatibility check for glass thickness, gap size and drip rail fit
  • Durable bottom shower door seal with reinforced entry point and 1mm wall thickness
  • Shower door bottom seal comparison showing SIMBA secure fit and improved water control
  • Why choose SIMBA shower seals: 30,--- uses tested, Quality rubber material, reach certified, and UK fast delivery
  • High-clarity close-up of a transparent shower bottom seal, showcasing the smooth finish and anti-UV material of the V456S20 to ensure its 20mm fin remains clear and invisible in frameless shower enclosures without yellowing.
  • Micro-view of a durable bathroom bottom gasket, showing reinforced U-channel walls and internal side rails engineered to grip 4-6mm glass firmly, providing a strong water barrier without silicone.
  • Installation guide for a shower door bottom seal, demonstrating the correct orientation of the V456S20 clipped onto the glass edge, indicating the 20mm fin should face the shower interior to deflect water effectively for various shower configurations with larger floor gaps.
  • Application guide for the shower seal
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4–6mm Glass Shower Door Bottom Seal – 20mm Fin | V456S20

£14.88
£20.88 £14.88
Sold out
-29%
Taxes included. Shipping calculated at checkout.
Total Length: 950mm
Gap: Seal 20mm

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Description

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professional solutions for your shower door


Technical Specifications

Engineered to Close Gaps of 17mm to 20mm

Catalog No. V456S20
Glass Thickness 4mm / 5mm / 6mm (Universal)
Gap Sealed 17mm – 20mm (Extra Large Gap)
Fin Depth 20mm Ultra-Flex Fin
Material Medical-Grade Virgin PVC
Installation Push-on (Snap-fit technology)
Package Includes 1x Strip + FREE D510 Threshold
Free UK Shipping | VAT Inc. 10-Month Warranty
Need another size? Check our full bottom shower seals collection for 4mm, 5mm and 6mm alternatives.

Frequently Asked Questions

Is the V456S20 right for me? +

The V456S20 is specifically designed for homeowners struggling with large gaps under shower doors that off-the-shelf products simply can't reach.

Extra Long Fin: Featuring a massive 20mm ultra-flex fin, it acts as a heavy-duty water deflector, ensuring high-pressure spray stays inside the tray.

Crystal Clear Durability: Unlike cheap imports, our medical-grade PVC prevents the common "black mould" buildup and stays transparent for longer.

Snap-on Simplicity: No messy silicone required. The rigid U-channel provides a secure friction-fit that won't slip once installed.

Not the right size?

What is the Free Gift (D510) used for? +

The D510 bar works in tandem with the 16mm fin to stop water dead. By installing the bar on your tray or floor, the fin overlaps it to create a secondary seal.

Expert Tip: Ensure the fin overlaps the bar by no more than 5mm to maintain a watertight seal without binding.

Order today and receive a FREE D510 Threshold Bar (Limited Time Offer)

Will this handle high-pressure showers? +
Absolutely. The V456S20 features a massive 20mm ultra-flex fin designed to deflect heavy water spray across extra-wide gaps.
Will it turn yellow over time? +
We use only Medical-Grade Virgin PVC. Unlike cheaper alternatives, our material is enriched with UV stabilisers and anti-fungal agents to keep the seal transparent and flexible.
Is it easy to install without tools? +
Absolutely. This is a Snap-On seal. The rigid U-channel uses friction to grip the glass securely. No messy silicone or tape required. Making it a versatile universal shower door seal replacement.
Specialist Guides & Long-Tail Resources on bottom seal? +

Not sure if a 20mm fin seal is right for your setup? Our expert library covers everything you need to know about shower door leak repair:

  • The Sizing Rule: Is 16mm right for your gap?
  • Installation Order: Vertical vs. bottom seal sequence.
  • Maintenance: How to inhibit black mould growth.

Get the perfect fit: [The V456S20 Specialist Guide: Measuring & Fitting for Large Gaps →]


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
Close-up cross-section of the V456S20 shower door bottom gasket fitted on 4-6mm glass, showing the transparent U-channel, side guide rails, and extended 20mm single fin gripping standard thickness glass to cover wider gaps.
4–6mm Glass Shower Door Bottom Seal..
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Care & Installation Tips

Ensure a better fit and longer-lasting clarity.

4–6mm Glass Shower Door Bottom Seal – 20mm Fin | V456S20 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.

Not sure which seal you need?

Send us a photo of your shower door edge and gap — we’ll help you find the right fit.

Certified Quality: ISO 9001 | ISO 14001 | REACH compliant +

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.

Have feedback on this seal? Tell us — we use customer input to improve future SIMBA designs.