4mm Shower Screen Seals

Find replacement 4mm shower screen seals for thin shower glass, bath screens and lightweight shower doors. Many SIMBA profiles use a flexible 4–6mm push-fit channel, so they can fit 4mm glass securely when the seal shape, fitting position and gap size are correct.

Choose by fitting position first: bottom seals for leaks under the door, vertical seals for side gaps, curved seals for quadrant or P-shaped screens, and magnetic seals for glass-to-glass closure. Always measure the glass itself, not the old seal, before ordering.

UK Stock Free UK Delivery 10-Month Warranty Fit Support Available

Choose Your 4mm Shower Seal by Position

Bottom seals

For water leaking under a shower door or bath screen.

Vertical seals

For side gaps between glass, wall, frame or fixed panel.

Curved seals

For quadrant shower enclosures and P-shaped bath screens.

Magnetic seals

For glass-to-glass closure on pivot, corner or bi-fold shower doors.

Edge protectors

For protecting exposed glass edges, not for stopping bottom leaks.

4mm Shower Screen Seal Size Guide

Swipe left to view more →

What to Measure What It Means Recommended Seal Type
Glass thickness Measure the glass itself, not the old seal. Choose products marked 4mm or 4–6mm glass.
Gap under the door Distance from the glass to the tray or bath rim. Bottom seal with a 12mm, 16mm, 20mm or 23mm fin.
Side gap Gap between glass and wall, frame or fixed panel. Vertical, H-shape, F-shape or bulb seal.
Door closure Glass-to-glass magnetic closing edge. Magnetic seal for 4–5mm glass.

Not sure whether your glass is exactly 4mm? Many replacement profiles in this collection are designed for 4–6mm glass, but the correct seal still depends on the shape, position and gap size.

Caret Down

43 products

Profile view of the DA456S15 hybrid seal fitted on 4-6mm glass, illustrating the combination of a soft compressible bulb for sealing and a rigid extended fin for water diversion, designed to bridge gaps up to 15mm in bottom or side configurations.Macro close-up of the DA456S15 transparent body, highlighting the high-gloss finish and the robust structural integration between the soft bulb and the guiding fin, engineered to maintain shape integrity under significant compression.

Bottom / Vertical Bubble Shower Door Seal for 4–6mm Glass Up to 15mm Gap DA456S15

From £14.88
£21.00 From £14.88
V456S12 4-6mm glass shower door bottom seal with 12mm finV456S12 shower door bottom seal dimensions for 4-6mm glass

Shower Door Bottom Seal Strip for 4–6mm Glass – 12mm Fin | V456S12

£14.88
£20.88 £14.88
V456S16 4-6mm glass shower door bottom seal with 16mm finV456S16 shower door bottom seal dimensions for 4-6mm glass

4–6mm Glass Shower Door Bottom Seal – 16mm Fin | V456S16

£14.88
£20.88 £14.88

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.

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

£14.88
£20.88 £14.88
"Profile view of the V456S2023 walk-in shower seal fitted on 4–6mm glass, featuring a symmetrical transparent U-channel with side guide rails and an extra-long central 23mm fin designed to bridge wide floor gaps effectively.""Technical dimension diagram of the V456S2023 strip, specifying the precise 4–6mm channel width, the maximum 23mm reach of the centrally positioned fin, and complete profile measurements for accurate fitting."

4–6mm Glass Shower Door Bottom Seal – 23mm Fin | V456S2023

£14.88
£20.88 £14.88
universal adhesive shower door sweep for large bottom gapUniversal Adhesive Shower Door Sweep & Bottom Seal – 12–35mm Gap | V312S1235H

Universal Adhesive Shower Door Sweep & Bottom Seal – 12–35mm Gap | V312S1235H

£14.88
£20.88 £14.88

V456S12CU curved shower screen seal cross-section for 4-6mm glassV456S12CU curved shower screen seal dimension diagram with 12mm fin

Curved Shower Screen Seal for 4–6mm Glass – 12mm Fin | V456S12CU

£19.80
£31.19 £19.80

V456S16CU curved shower screen seal cross-section for 4-6mm glassV456S16CU curved shower screen seal dimension diagram with 16mm fin

Curved Shower Screen Seal for 4–6mm Glass – 16mm Fin | V456S16CU

£19.80
£31.19 £19.80
V456S20CU curved shower screen seal cross-section for 4-6mm glassV456S20CU curved shower screen seal dimension diagram with 20mm fin

Curved Shower Screen Seal for 4–6mm Glass – 20mm Fin | V456S20CU

£19.80
£31.19 £19.80

V456S23CU curved shower screen seal cross-section for 4-6mm glassV456S23CU curved shower screen seal dimension diagram with 23mm fin

Curved Shower Screen Seal for 4–6mm Glass – 23mm Fin | V456S23CU

£19.80
£31.19 £19.80

V312S1235F self-adhesive curved bath screen seal trim for 12-35mm gapV312S1235F self-adhesive bath seal trim dimension diagram for curved screens

Self-Adhesive Curved Bath Screen Seal Trim – 12–35mm Gap | V312S1235F

£14.88
£20.88 £14.88
H456S8 H-shape vertical shower door seal for 4–6mm glass and 3–6mm gaps8mm fin shower door seal for 4–6mm glass with 3–6mm gap coverage

4–6mm H-Shape Vertical Shower Door Seal – 8mm Fin H456S8

£29.99
£35.99 £29.99
H456S15 H-shape vertical shower door seal for 4–6mm glass and 3–13mm side gaps15mm fin shower door seal for wider 3–13mm vertical side gaps

4–6mm H-Shape Vertical Shower Door Seal 15mm Fin H456S15

£29.99
£35.99 £29.99
H456S20 clear shower door seal for 4-6mm glass and 3-18mm glass-to-glass gapsH456S20 shower door seal size diagram showing 20mm soft fin for 3-18mm gaps

4–6mm H-Shape Vertical Shower Door Seal – 20mm Fin H456S20

From £3.48
£7.19 From £3.48
H456S2025 clear shower door seal for 4-6mm glass and 3-23mm glass-to-glass gapsH456S2025 shower door seal size diagram showing 25mm soft fin for 3-23mm gaps

4–6mm H-Shape Vertical Shower Door Seal – 25mm Fin H456S2025

£29.99
£35.99 £29.99
D456S7 vertical shower door bubble seal for 4–6mm glass and small side gapsD456S7 shower door bubble seal profile for 4–6mm glass with 7mm bubble

Vertical Bubble Shower Door Seal for 4–6mm Glass – 6mm Gap D456S7

From £14.88
£21.00 From £14.88

Large bubble vertical shower seal for 4–6mm glass shower doors, sealing gaps up to 11mmD456S12 vertical shower door seal with large bubble design for 4–6mm glass and 11mm gap

Large Bubble Shower Door Seal for 4–6mm Glass Up to 11mm Gap D456S12

From £14.88
£21.00 From £14.88
8mm self-adhesive T-shape shower threshold seal RY3463 with 13mm finTechnical drawing of RY3463 seal showing 8mm T-groove and 13mm extra long fin

8mm Self-Adhesive T-Shape Shower Threshold Seal – 13mm Fin | RY3463

From £3.48
£20.88 From £3.48
Clear shower threshold seal strip D510 for shower traysClear Shower Door Threshold Seal Strip for Shower Tray – D510

Clear Shower Door Threshold Seal Strip for Shower Tray – D510

£14.88
£20.88 £14.88

Low-profile shower glass threshold channel seal VG003Engineering drawing of VG003 showing the rigid low-profile adhesive base and dimensions

Low-Profile Shower Glass Threshold Channel Seal – VG003

£29.99
£38.70 £29.99
Cross-section of PV29 clear shower threshold bulb sealClear Adhesive Shower Threshold Bulb Seal Strip – PV29

Clear Adhesive Shower Threshold Bulb Seal Strip – PV29

£14.88
£20.88 £14.88

F Shape Shower Door Seal | 8mm Slim Fin | Fits 4mm, 5mm & 6mm Glass F456S8F Shape Shower Door Seal | 8mm Slim Fin | Fits 4mm, 5mm & 6mm Glass F456S8

F Shape Shower Door Seal | 8mm Slim Fin | Fits 4mm, 5mm & 6mm Glass F456S8

£32.70
£35.99 £32.70
F Shape Shower Door Seal | 12mm Standard Fin | Fits 4mm, 5mm & 6mm Glass F456S12F Shape Shower Door Seal | 12mm Standard Fin | Fits 4mm, 5mm & 6mm Glass F456S12

F Shape Shower Door Seal | 12mm Standard Fin | Fits 4mm, 5mm & 6mm Glass F456S12

£32.70
£35.99 £32.70
F Shape Shower Door Seal | 15mm 'Extended' Fin | Fits 4mm, 5mm & 6mm Glass F456S15F Shape Shower Door Seal | 15mm 'Extended' Fin | Fits 4mm, 5mm & 6mm Glass F456S15

F Shape Shower Door Seal | 15mm 'Extended' Fin | Fits 4mm, 5mm & 6mm Glass F456S15

£32.70
£35.99 £32.70

4mm Shower Screen Seal FAQ

Common questions about choosing, fitting and replacing shower screen seals for 4mm glass, older bath screens and lightweight shower doors.

Are 4mm shower screen seals the same as 4–6mm seals?

Many replacement shower screen seals are designed to fit a small range of glass thicknesses, such as 4mm, 5mm and 6mm.

If a product is marked for 4–6mm glass, it can usually be used on 4mm glass when the channel, profile shape and fitting position are correct.

Will a 4–6mm shower seal grip securely on 4mm glass?

It should grip securely if the seal is designed for 4–6mm glass and the glass edge is clean and dry before fitting.

Because 4mm glass is at the thinner end of the range, choosing the correct profile is especially important to avoid slipping or loose fitting.

How do I choose the right seal for a 4mm shower screen?

Start by checking where the seal fits. Use a bottom seal for leaks under the door, a vertical or side seal for gaps near the wall or frame, a curved seal for quadrant or P-shaped screens, and a magnetic seal for glass-to-glass closure.

After choosing the position, measure the gap you need to cover and compare your old seal profile with the product images before ordering.

Can I use a 5mm or 6mm shower seal on 4mm glass?

Only if the product is clearly marked as suitable for 4–6mm glass.

A seal designed only for 5mm or 6mm glass may not grip firmly on thinner 4mm glass and could slide, twist or fall off during use.

Why does my 4mm shower screen seal keep sliding off?

Sliding usually means the seal channel is too wide for the glass, the glass edge was not cleaned properly, or the seal profile does not match the original fitting position.

Remove any limescale or soap residue from the glass edge before fitting the new seal.

Are 4mm shower screen seals suitable for older bath screens?

Yes, many older and lightweight bath screens use thinner glass, including 4mm glass.

The key is to match the seal type to the screen design, such as bottom, side, curved, framed or magnetic.

Which 4mm shower seal should I use to stop water leaking under the door?

For water leaking under the door, choose a bottom shower seal with a soft fin or drip rail.

Measure the gap between the bottom of the glass and the shower tray or bath rim, then choose the closest fin length.

Do I need glue or silicone for a 4mm shower screen seal?

Most push-fit shower screen seals do not need glue or silicone.

For 4mm glass, it is better to choose a correctly sized channel so the seal grips the glass naturally. Adhesive should only be used where the product is designed as a self-adhesive seal.

Is Your Shower Glass Around 4mm?

4mm shower glass is often found on older bath screens, lightweight shower doors and thinner shower panels. Small measuring differences are common, so use this guide to check where your glass sits within the 4–6mm shower screen seal range.

Swipe left to view more →

Your Measurement What It Usually Means Best Page to Check Main Buying Concern
Around 4mm
You are here 		Thin glass, often found on older bath screens or lightweight shower doors. 4mm shower screen seals Making sure the seal grips thinner glass securely without sliding off.
Around 5mm Middle of the 4–6mm compatible range. This can happen when measuring with a ruler. 5mm shower screen seals Confirming whether your measurement sits within the 4–6mm range.
Around 6mm Common thickness for many standard UK shower doors and bath screens. 6mm shower screen seals Choosing the right profile for a standard shower door or screen.