26138-9004
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Suits Door D2345 ZADI
Replacement barrel only for Thetford access doors
Suits key number 9004
26138-9004
Lost a key? Need a spare? Want one key for every door? This guide covers what Zadi locks do, how they work, what goes wrong — and exactly how to sort it out.
Zadi keys are one of the most misunderstood parts on a caravan.Customers lose them, order the wrong number, mix up keys and barrels, or don't realise they can upgrade to a single key for every external door. Read on and you'll know exactly what to do yourself.
Thetford is the brand behind most caravan cassette toilets and external access doors. The locking system fitted to these doors is made by an Italian lock manufacturer called Zadi.
You'll find Zadi locks on:
The small hatch on the outside of the van where you remove the cassette. Used on C2, C4, C200, C250, C400 and more.
Larger hatches covering water pumps, gas regulators, battery boxes, or storage — Thetford Service Door 3, 4, 5, 6 and 7.
Some manufacturers also use Zadi barrels in gas locker doors and battery compartments on Thetford-branded doors.
Every Zadi lock uses a small cylindrical barrel that sits inside the door housing. The key turns the barrel, which moves a small latch to lock or unlock the door. The barrel and the key have a matching key number stamped on them — this is the critical piece of information.
Every Zadi barrel is coded to a specific key number (e.g. 9001, 9003, 9010, 9017). The number is usually stamped on the bow (the flat grip part) of the key itself. Only a key with the matching number will turn that barrel.
Check your existing key. Turn it over and look for a 4-digit number — usually starting with 9 (9001, 9003, 9010, 9017, etc.).
Check inside the door frame.There's often a sticker inside the door frame or on the barrel housing with the model and key number printed on it.
No key, no sticker? You'll need to replace the entire barrel and key set together. When ordered as a set without a specified number, they come with a random key number — which is fine, just note the new number going forward.
Customers often order a replacement key without noting their key number first — then find it doesn't fit. Always check the key number before ordering keys only. If you've lost all your keys and don't know the number, order a full barrel + key set and start fresh.
| Situation | Solution | Parts Needed |
|---|---|---|
Lost one key, still have the other |
Order a replacement key to match your key number |
|
Lost all keys, don't know the number |
Replace barrel + keys as a set |
|
Key won't turn at all |
Wrong key number, or barrel is seized — try lubricant first, then replace |
Check number first |
Want one key for all external locks |
Upgrade to CAMEC One-Key system with Thetford adaptor |
|
Key turns but door won't open |
Barrel mechanism worn — replace barrel, check housing too |
Tired of carrying four different keys for the water filler, toilet hatch, boot handle and gas locker? The CAMEC One-Key system is the answer. It replaces the individual barrels across all your compatible external locks with a set of identically-keyed barrels, so one key opens everything.
Yes — but you need a Thetford adaptor housing (sold separately). The CAMEC barrel is a slightly different size to the standard Zadi barrel, so the adaptor replaces the lock housing inside the door, then accepts the CAMEC One-Key barrel. Barrels and keys are sold separately from the adaptor.
Zadi locks are robust but caravan environments are tough. Here's what tends to go wrong:
Worn or seized barrel
Constant UV exposure, dust, and moisture work their way into the barrel over time. The key may start feeling stiff, then eventually won't turn at all. A squirt of dry PTFE lubricant (not WD-40, which attracts more dust) can buy time, but a worn barrel needs replacing before it fails completely and locks you out.
Broken or snapped key
Caravan keys are thin. If a key snaps in the barrel, don't force it. The barrel will likely need to come out from the inside (via the inner cover plate) to clear the broken section. If the barrel itself is damaged, replace the whole set.
Lost springs or O-ring on reassembly
The small conical spring and O-ring inside the lock housing are easy to lose during a barrel swap. Without the spring, the barrel won't have the correct tension. Without the O-ring, moisture will get in. Always work over a clean, flat surface and check your new kit includes these components.
Wrong barrel installed
This is more common than you'd think — a replacement barrel that's physically similar but the wrong type (e.g. a Zadi barrel forced into a housing designed for CAMEC, or vice versa). If the key turns but nothing engages, or the barrel won't click into place, double-check compatibility before forcing anything.
Damaged housing
If the plastic housing that holds the barrel is cracked or the retention clip is broken, a new barrel won't sit securely. The housing (sometimes called the lock barrel holder) is a separate part and available to replace independently.
Order a Zadi barrel and key kit .This comes with one new barrel and two keys. The key number will be random — note it down as soon as you open the pack, and keep one key somewhere safe (not just on your key ring).
Not at a regular locksmith — Zadi keys are not cut from a blank like a house key. You need to order a replacement Zadi key to your exact key number. Check the number stamped on your existing key, then order that specific number. Keys are sold in pairs.
The barrel is turning but not engaging the latch properly. This usually means the barrel is worn, or the internal latch mechanism has an issue. Start by replacing the barrel. If the problem continues, the door latch assembly itself may need attention.
Yes! Look into the CAMEC One-Key system. For Thetford Zadi locks specifically, you'll need the Thetford adaptor housing plus a CAMEC One-Key barrel kit. It's a small investment but incredibly convenient. Note: it won't work on locks made before 2012, and there are limitations around boot handles.
Make sure the new barrel's orientation matches the housing slot before inserting. Push it in firmly and straight — it needs to click into place. If it won't click, check that the small conical spring is correctly seated in the housing first. Also confirm you have the correct barrel for your door model.
A straight barrel swap is very DIY-friendly — most people manage it in under 15 minutes once they have the right tools. Where it gets tricky is if the housing is damaged, the old barrel is stuck, or there's an issue with the internal latch. In those cases it's worth having a technician take a look.
You can reach our customer support team via email or phone during business hours. Visit our contact page for details.
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