Description
Avocet WKMUNIT Universal uPVC Window Keep Plate 58mm — Pack of 2
Pack of 2 universal uPVC window keep plates in passivated zinc alloy, supplied with 12 packers — replace worn or discontinued mushroom striker keeps.
Avocet Universal uPVC Window Mushroom Striker Keep Plate (WKMUNIT) — Pack of 2 solves one of the most frustrating problems in window repair: your espagnolette lock still works perfectly, but the keep it locks into is chewed, loose, or simply no longer made. Profile companies redesign their systems every few years, and once a profile is superseded the matching keeps are discontinued — leaving you hunting for a part that no longer exists. These universal keeps are designed to accept the mushroom cams found on most uPVC window espagnolette locks, and each keep ships with three thicknesses of profile-related packer so you can build it up to the correct height for your frame. They are a direct replacement for the older ERKUNIM keeps.
This 2 pack is the practical choice for most repairs. A single window sash commonly locks at two or more points, so a failed keep is rarely the only tired one on the frame — and matching the pair means both engage at the same depth rather than one doing all the work. I
The keeps are manufactured from zinc alloy with a passivated finish — a treatment applied specifically to slow surface corrosion on a part that lives in the wettest position on the window, right in the drainage path of the frame rebate.
Please read this before ordering: keeps are a profile-related part. They were made to suit one specific frame section at the point of manufacture, so no keep on the market is a guaranteed drop-in match for every window. These are universal keeps — they are intended to be packed, and in some cases lightly modified, to suit your particular profile. Check the dimensions below against your existing keep before you buy: 58mm long × 33mm wide × 6mm high, with 14mm between the screw hole centres.
Key Benefits for uPVC Window Owners:
- Two Keeps in One Pack — Do the Job Properly – Most sashes lock at more than one point, and if one keep has worn the others are usually the same age. Replacing them as a pair gives even engagement across the sash and saves you ordering again in six months.
- Universal Design Fills the Gap Left by Discontinued Parts – If your original keep has been obsolete for years, this is often the practical answer. They are built to accept the mushroom cams commonly used across uPVC window espagnolette locks rather than one single manufacturer's system.
- Twelve Packers Supplied — Six Per Keep – Each keep comes with two each of 2mm, 4mm and 6mm metal packing shims. They fit underneath the keep and to build up the height your profile needs, so you are not stuck if a keep sits too low against the frame.
- Restores a Tight, Draught-Free Close – A worn or badly seated keep lets the sash sit slack in the frame, which is where the draughts and rattles start. Correctly packed keeps pull the sash firmly back onto the seal and help cut heat loss.
- Improves Window Security – A loose or damaged keep means the mushroom cam is not being properly captured, which undermines the whole locking system. Replacing them restores the positive engagement the lock was designed to give.
- A Realistic DIY Job – With the right packer combination and a screwdriver, most competent DIYers can change window keeps in minutes. No specialist tools are needed for a standard fit.
Product Specifications:
- Brand: Avocet
- Product Type: Universal uPVC window lock striker keep plate (mushroom keep)
- Pack Quantity: 2 keeps
- Part Number: WKMUNIT
- Replaces: The old ERKUNIM keeps
- Material: Zinc alloy
- Finish: Passivated
- Length: 58mm (each)
- Width: 33mm (each)
- Height: 6mm (each)
- Distance Between Screw Hole Centres: 14mm
- Cam Type Accepted: Mushroom cams, as commonly fitted to uPVC window espagnolette locks
- Packers Included: 12 in total — 4 × 2mm, 4 × 4mm and 4 × 6mm profile-related metal packing shims (6 per keep)
- Suitable For: uPVC windows fitted with mushroom cam espagnolette locking
Please measure your existing keep before ordering. Check the overall length and width, the height it sits at, and — most importantly — the distance between your existing screw hole centres. Because keeps are profile-specific, we cannot guarantee a like-for-like match for every window system, and some frames will need the keep packing or the uPVC upstand easing to suit. If you are unsure, send us the measurements of your old keep and we will do our best to advise.
Pro Tips:
Pro Tip: Dry-fit before you commit, and do one keep at a time. Hold the keep in position with your chosen packers behind it, close the sash gently and turn the handle to see whether the mushroom cam engages cleanly — do not force it. If the cam catches, add a packer; if the sash pulls too tight against the seal, drop down a thickness. When you fit the second keep, set it to match the compression of the first rather than assuming the same packer stack: frames rarely wear evenly, and one point pulling harder than the other is what strains a gearbox. Only when the sash closes with firm, even pressure along its length should you screw both keeps down permanently.
Package Contents:
- 2 × Avocet universal window striker keep plates — part number WKMUNIT
- 4 × 2mm profile-related metal packers
- 4 × 4mm profile-related metal packers
- 4 × 6mm profile-related metal packers
Fixing screws are not supplied. Keeps are fitted to a wide range of frame sections and reinforcement types, and the correct screw length depends on your profile depth and whether the frame is steel-reinforced — so we would rather you used the right fixing for your window than a generic one that may be too short to bite or too long to seat. In most cases the screws from your existing keeps can be reused.
Frequently Asked Questions:
Will these universal keeps fit my uPVC window?
They will fit many windows, but not all — and it is important to be straight about that. Keeps are a profile-related part, made to suit one specific frame section at the time your window was manufactured. Measure your existing keep first: these are 58mm long, 33mm wide and 6mm high, with 14mm between the screw hole centres. If those figures are close to your original and your lock uses mushroom cams, this is a strong candidate — with the packers used to fine-tune the height.
How many keeps do I get, and how many packers come with them?
You receive 2 keeps and 12 packers in total — 4 × 2mm, 4 × 4mm and 4 × 6mm, which works out at six packers per keep (two of each thickness). That gives you the full range of packing options on both keeps independently.
Do I need to replace both keeps at the same time?
Not necessarily, but it is usually the sensible approach. Keeps on the same sash have done the same work over the same number of years, so if one has worn enough to cause trouble the others are rarely far behind. Replacing them together also means the sash is pulled up evenly at every locking point, which is better for the seal and easier on the gearbox. If you only need one now, the second is a useful spare.
What are the packers for and which ones do I use?
The metal packing shims fit underneath the keep, between the keep and the frame, to lift it to the correct height for your profile.
What if a keep still does not sit correctly against my profile?
Because obsolete profile shapes cannot be matched exactly, the usual approach is to adjust the fit rather than keep searching for a discontinued part. Most fitters ease back a small amount of the uPVC upstand with a sharp wood chisel or a Stanley knife so the keep beds down properly. Work slowly, take off less than you think you need, and re-test the close as you go — you can always remove more, but you cannot put it back.
Are these the same as ERKINUM or ERKUNIM keeps?
Yes — the WKMUNIT is a direct replacement for the older ERKUNIM keeps, which you may find written either way depending on the source. If that is the code stamped on or listed against your existing part, this is the keep you are looking for.
Why Choose the Avocet Universal uPVC Window Keep Plate (WKMUNIT) Twin Pack?
When a window keep fails, most people are told the answer is a new window. It rarely is. The Avocet WKMUNIT universal mushroom striker keep exists precisely for the windows the industry has moved on from — the ones where the original part was discontinued years ago and the only sensible route left is a well-made universal keep, packed to suit. Manufactured in passivated zinc alloy and supplied as a pair with a full set of twelve packers, this twin pack gives you enough to sort a sash properly in one go and get a firm, secure, draught-free close from a window you already own.
JCP Hardware has spent over 30 years supplying uPVC window and door replacement parts to homeowners and trade customers across the UK, and window keeps are one of the parts we are asked about most. If you are unsure whether these keeps suit your profile, measure your existing one — length, width, height and screw hole centres — and get in touch before you order. We would far rather help you get it right first time than have you send it back.
Specifications
Pack Quantity : |
2 |
