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

F Shape Shower Door Seal | 20mm Mid-Range Fin | Fits 4mm, 5mm & 6mm Glass F456S20F Shape Shower Door Seal | 20mm Mid-Range Fin | Fits 4mm, 5mm & 6mm Glass F456S20

F Shape Shower Door Seal | 20mm Mid-Range Fin | Fits 4mm, 5mm & 6mm Glass F456S20

£32.70
£35.99 £32.70
F Shape Shower Door Seal | 35mm Extra-Long Fin | Fits 4mm, 5mm & 6mm Glass F456S2535F Shape Shower Door Seal | 35mm Extra-Long Fin | Fits 4mm, 5mm & 6mm Glass F456S2535

F Shape Shower Door Seal | 35mm Extra-Long Fin | Fits 4mm, 5mm & 6mm Glass F456S2535

£32.70
£35.99 £32.70
4–6mm Glass Sliding Door F-Shape Seal FD456S10154–6mm Glass Sliding Door F-Shape Seal FD456S1015

4–6mm Glass Sliding Door F-Shape Seal FD456S1015

£32.70
£35.99 £32.70
4–6mm Glass F-Type Sliding Screen Seal FD456S20254–6mm Glass F-Type Sliding Screen Seal FD456S2025

4–6mm Glass F-Type Sliding Screen Seal FD456S2025

£32.70
£35.99 £32.70
135° Vertical Shower Door Seal P045DJ

135° Vertical Shower Door Seal P045DJ

£29.99
£43.19 £29.99
135° Shower Door Side Seal for Angled Glass Panels P045SJ

135° Shower Door Side Seal for Angled Glass Panels P045SJ

£29.99
£43.19 £29.99
180° Magnetic Shower Door Seal for Pivot & Hinged Shower Doors, 4-5mm Glass, 22mm Gap, M45A2M180° Magnetic Shower Door Seal for Pivot & Hinged Shower Doors, 4-5mm Glass, 22mm Gap, M45A2M

180° Magnetic Shower Door Seal for Pivot & Hinged Shower Doors, 4-5mm Glass, 22mm Gap, M45A2M

£32.70
£38.70 £32.70
M45B2M sliding shower door magnetic seal pair for 4-5mm glass and 22mm gapM45B2M magnetic shower seal fitted to a sliding glass shower door

4-5mm 180° Sliding Shower Door Magnetic Seal 22mm Gap M45B2M

£32.70
£38.70 £32.70
M45C2M sliding shower door magnetic seal pair for 4-5mm glass and 22mm gapM45C2M push-on magnetic shower seal fitted to sliding glass door

4-5mm 180° Sliding Shower Door Magnetic Seal 22mm Gap M45C2M

£32.70
£38.70 £32.70
M45A2M magnetic shower door seal for 4-5mm glass with 9mm closing gapClear magnetic shower door seal pair for 4mm and 5mm glass

90° Magnetic Shower Door Seal Pair for 4–5mm Glass | 9mm Gap M45A2M

£32.70
£38.70 £32.70
M45C2M magnetic shower door seal fitted on 135 degree glass doorM45C2M white PVC magnetic shower seal pair with black magnetic strip

135° Magnetic Shower Door Seal Pair for 4–5mm Glass | 21mm Gap M45C2M

£32.70
£38.70 £32.70
UH456 U-shape shower screen edge protector fitted on 4-6mm glass showing a secure no-gap fit for safety and water containment in UK bathrooms.Technical dimensions diagram of UH456 U-channel glass guard, specifically designed to clamp tightly onto 4mm to 6mm thick shower screen panels without adhesive.

U-Shape Shower Screen Edge Protector 4-6mm Glass No-gap UH456

£14.88
£20.88 £14.88
HH456 H shape vertical shower door seal for 4-6mm glass panelsHH456 shower seal dimensions showing rigid body and flexible fins

H Shape Vertical Shower Door Seal – 4-6mm Glass, 3-6mm Gap HH456

£29.99
£35.99 £29.99
Profile view of the VC456 offset bottom seal fitted on 4-6mm glass, showing the asymmetric U-channel design with a supporting side triangle and an 18mm fin engineered to span gaps from 15mm to 18mm at the shower base.Technical dimension diagram of the VC456 strip, detailing the 4-6mm inner channel, the 18mm fin length, and the effective coverage range of 15–18mm for accommodating wider floor-to-glass separations.

4–6mm Offset Shower Door Bottom Seal – 15–18mm Gap | VC456

£14.88
£20.88 £14.88
Cross-section view of the S456DTL 4-6mm glass bottom seal installed, highlighting the transparent U-channel grip and extended side fins that create a zero-gap barrier against water leakage.Detailed dimension diagram of the S456DTL slimline bottom seal, specifying exact inner width for 4-6mm glass, fin length, and total height to ensure compatibility with various shower door types.

4–6mm Glass Side-Fin Shower Door Bottom Seal | S456DTL

£14.88
£20.88 £14.88
self adhesive shower door sweep for sliding glass doorTechnical dimension diagram of the S312DTL7 strip, specifying the adhesive contact width, material thickness, and fin length intended to provide coverage while accommodating various bottom hardware positions.

Self-Adhesive Sliding Shower Door Sweep & Bottom Seal – Side Fin Up to 25mm Gap | S312DTL7

£14.88
£20.88 £14.88
Close-up cross-section of the VD456 seal for bottom of shower door fitted on 4-6mm glass, showing the transparent U-channel, side guide rails, and the unique 17mm single fin with a central small bulb design for enhanced sealing on uneven floors.Technical dimension diagram for a shower bottom seal, detailing the inner channel width, 17mm central fin length (including central bulb diameter), and overall profile height with lateral stabilising rails, engineered for precise replacement on 4-6mm thick glass.

4-6mm Glass Shower Door Bottom Gasket Replacement 17mm Fin VD456

£14.88
£20.88 £14.88
Profile view of the VB456 bottom seal fitted on 4-6mm glass, illustrating the transparent U-channel grip and the dual-fin configuration designed to provide extended coverage and enhanced water deflection on shower thresholds.Technical dimension diagram of the VB456 strip, specifying the 4-6mm inner channel range and the length and spacing of the twin fins, intended to accommodate varying floor levels and gap widths.

4–6mm Glass Double-Fin Shower Door Bottom Seal – 9mm Fin | VB456

£14.88
£43.19 £14.88
SIMBA S312S1235 universal adhesive TPE sauna door seal installed onto a frameless glass door bottom, showing optical clarity and secure bond.Close-up photogragh of S312S1235 high-temperature TPE seal profile, highlighting the pre-applied high-bond adhesive tape and flexible 35mm fin.

High-Temperature TPE Sauna Door Adhesive Seal S312S1235

£29.76
£20.88 £29.76

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.