JCP White uPVC Locking Wedge Window Sash Cavity Closing Draught Sealing 5 Pairs

JCP uPVC Window Locking Wedge — Draught Sealing, Sash Closing & Security Wedge

Stop hinge-side draughts, pull bowing uPVC window sashes tight, and improve window security with JCP profile-specific sash cavity closing wedges — supplied in packs of 10, making 5 pairs.

JCP uPVC Window Locking Wedges are the fix for windows that no longer close tightly against their gasket seals. If you've noticed cold air creeping in around the hinge side of a casement window, a sash that bows away from the frame, or a window that simply doesn't pull shut as firmly as it once did, these small two-part interlocking wedges are designed to solve exactly that. As the window closes, the angled wedges slide together and pull the opening sash tight onto the outer frame — restoring a snug, weather-tight seal and adding meaningful resistance against forced entry.

Manufactured in durable white uPVC plastic to match standard white window frames, these wedges are supplied in bags of 10 (making 5 pairs) and are available in five profile-specific versions to suit Rehau, Veka, Veka Egress, Spectus Elite 70, and Profile 22 systems. Choosing the correct code for your window profile is essential — please use the comparison table below to identify the right variant before ordering.

Key Benefits for uPVC Window Owners:

• Eliminates Hinge-Side Draughts – Pulls the opening sash tightly onto the gasket seals as the window closes, sealing the gap that causes cold air ingress and noticeable heat loss around the hinge edge.
• Lowers Heating Bills – By restoring a proper compression seal between sash and frame, these wedges help reduce the warm air escaping through ageing or distorted casement windows — a low-cost upgrade with year-round energy savings.
• Corrects Bowing Sashes – On larger windows where the sash has bowed slightly outward over time, the wedges physically pull the two halves back into alignment, restoring the original tight closure.
• Adds Security Against Forced Entry – Once engaged, the interlocking wedges provide additional mechanical resistance, making it significantly harder for an intruder to lever the sash away from the frame.
• Suits Top Hung & Side Hung Windows – Works with both opening configurations and is compatible with 13mm and 17mm friction stay stack heights, covering the vast majority of uPVC casement window setups.
• Profile-Specific for Correct Closing Angle – Five distinct variants are offered because different window systems have different euro-grove postioning. The 40186 Veka Egress wedge, for instance, is specifically angled for egress hinges, which close differently to standard friction hinges.
• Cost-Effective Repair Solution – At a fraction of the cost of replacing the window or hinges, fitting the correct closing wedges can fully restore weather-tight performance to an otherwise functional uPVC window.
• Supplied in Pairs – Each bag of 10 makes 5 pairs, giving enough wedges to treat multiple windows or keep spares for future maintenance — ideal for landlords, trade fitters, and homeowners with multiple affected windows.

Profile Compatibility — Choose the Correct Code:

Please choose the correct profile code before ordering: Rehau, Veka, Veka Egress, Spectus Elite 70, and Profile 22 versions are not interchangeable.

Important: These wedges are profile-specific and will not seat correctly in non-matching euro-grooves.

Product Specifications:

• Brand: JCP
• Product Type: Sash Cavity Closing Wedge / Locking Wedge
• Colour: White
• Pack Quantity: Bag of 10 (makes 5 pairs)
• Available Variants: 280 (Rehau), 188 (Veka), 186 (Veka Egress), 285 (Spectus Elite 70), 181 (Profile 22)
• Compatibility: uPVC casement windows — top hung and side hung
• Friction Stay Compatibility: 13mm and 17mm stack heights
• Function: Two-part interlocking wedge — one half fits the sash euro-groove, opposing half fixes to the outer frame
• Primary Use: Draught sealing, sash alignment correction, security enhancement

Please confirm your window profile system carefully before ordering, as each variant is shaped specifically to its profile system's closing geometry.

Pro Tips:

Pro Tip: Fit the first half of the wedge into the euro-groove on the opening sash, then mark its centre on the sash edge so you can transfer that point accurately to the outer frame for the opposing wedge — this guarantees the two halves meet correctly when the window closes. Before fixing anything permanently, check that both profiles are level and not bowed out of shape, as a distorted frame will stop the wedges locating properly and may actually widen the gap rather than close it. Depending on how close your two profiles sit when the window is shut, you may need to add a small packing shim underneath one half to bring them firmly together.

Package Contents:

• 10 × JCP uPVC Window Locking Wedges (5 matched pairs) in your selected profile variant

Also Known As — Alternative Names for uPVC Sash Cavity Wedges:

This component goes by several names across the UK uPVC industry — you may also see it called a Sash Cavity Wedge, Pull-in Block, Cavity Closing Wedge, Closing Wedge, Cavity Close, uPVC Sash Pull-in, Compression Wedge, or Frame/Sash Interlock Wedge. The function is identical regardless of the name used: pulling the opening sash and outer frame together to eliminate draughts, correct bowing, and reinforce closing security.

Frequently Asked Questions:

How do I know which wedge variant I need for my windows?
The variant depends on your uPVC window profile system. Standard Rehau S706, Duraflex, and Selecta profiles take code 280. Veka and LB Sheerframe profiles with standard friction hinges take 188 — but if your Veka window uses egress hinges, you must use 186 instead, as the closing angle is different. Spectus Elite 70 (BM02) takes 285, and Profile 22 systems take 181. The profile system is usually printed on the inside edge of the sash or frame, or on a sticker inside the window. If you can't identify it, send us a photo and we'll help.

Will these wedges actually stop draughts coming through my window?
Yes — provided the draught is caused by the sash not closing tightly enough onto the gasket seal, which is the most common cause on the hinge side of older or larger uPVC windows. The wedges work by physically pulling the sash and outer frame together as the window closes, restoring the compression seal. If the draught is caused by a perished or shrunken gasket itself, you may need to replace the gasket as well — we stock a range of replacement weatherseals to suit.

Are these difficult to fit, and what tools do I need?
Fitting is straightforward for most DIYers. You'll need a tape measure, a pencil for marking, and a screwdriver for the fixing screws. The first wedge half slots into the existing euro-groove on the sash, and the second half screws to the outer frame at the corresponding point. Most people can fit a pair in 10–15 minutes per window. The key is accurate alignment — see our Pro Tip above.

Do these work on top hung as well as side hung windows?
Yes, they suit both top hung and side hung uPVC casement windows, and they're compatible with both 13mm and 17mm friction stay stack heights — which covers the vast majority of uPVC window installations in the UK.

Can these improve security as well as sealing?
Yes. Once the window is closed, the interlocking wedges create additional mechanical resistance against an intruder attempting to lever the sash away from the frame. They aren't a substitute for proper window locks or a multi-point locking mechanism, but they meaningfully improve the integrity of the closed sash — which is a known weak point on older uPVC windows.

Why Choose the JCP uPVC Window Locking Wedge?

JCP Hardware has supplied the UK uPVC window and door industry for over 30 years, and our profile-specific sash cavity closing wedges reflect that experience — they're stocked in five distinct variants precisely because we know one shape doesn't fit every system. Whether you're a homeowner trying to fix a draughty bedroom window before winter, a landlord maintaining a portfolio of properties, or a trade fitter sourcing reliable replacement parts, these wedges deliver a low-cost, long-lasting solution to a problem that would otherwise mean a much bigger repair bill.