A stopcock is the main valve that controls all the water coming into your property. To shut the water off, turn it clockwise. Gently, by hand, and never with a wrench.
It is also called a stop tap, and in Spain you will see it and hear it called the llave de paso — worth knowing when you have to explain over the phone which valve you mean.
In this article
What is a stopcock?
It is the valve that turns off the water to the whole property. One valve, everything downstream of it.
That makes it the single most useful thing in the building on the day a pipe fails — and the single most useless, if nobody knows where it is or it has seized shut over twenty years of never being touched. Find it before you need it. That is the entire point of this article.
Not every valve is the stopcock
There are usually several shut-off points in a property, and they do different jobs:
| Type | What it does | Who normally uses it |
|---|---|---|
| Internal stopcock | Turns off the water inside the property | You, a plumber, a property manager |
| External stopcock | Controls the supply before it enters the property | The water supplier, or a plumber, depending on access |
| Appliance isolation valve | Turns off water to one appliance or fixture | You or a plumber |
| Toilet isolation valve | Turns off water to one toilet | You or a plumber |
The one you want in an emergency is the internal stopcock. The isolation valves are useful for a specific problem — a leaking toilet, a washing machine hose — because they let you stop that one thing without cutting water to the whole house.
Where is it usually located?
It depends on the property, and on who built it. These are the usual places:
| Area | Where to look |
|---|---|
| Kitchen | Under the sink, or in a nearby cupboard |
| Utility room | Near the washing machine or the supply pipework |
| Bathroom | In a cupboard, a vanity unit or a service area |
| Garage | Near the wall where the water enters |
| Entrance | Near the front wall, the hallway, or a meter cupboard |
| Outside | In a meter box or a service chamber |
| Apartment | A communal service area, a cupboard, or near the water meter |
Older properties, renovated ones and apartments are the awkward cases. A renovation can leave the valve behind a new unit or inside a boxed-in section, and in a block there may be a valve inside the flat and another in a shared riser that do not do the same thing.
How to turn it off safely
- Find the valveThe internal one, not an appliance isolation valve.
- Turn it clockwiseGently, by hand. Clockwise closes, anticlockwise opens — the same as a tap.
- Do not force itIf it will not move easily, stop there. A seized valve forced with a wrench can break, and it tends to break open.
- Check the water actually stoppedOpen a cold tap. If water keeps running after a few seconds, the valve turned but did not seal — which is a fault, even though it felt like it worked.
- Keep it accessibleDo not store things in front of it. The day you need it, you will need it quickly and probably in the dark.
Label it. A small tag saying what it is costs nothing and means a guest, a tenant, a neighbour or a family member can find it without you. In a holiday rental this is the difference between a wet floor and a flooded apartment.
What if it is stuck or hard to turn?
Do not force it. That is the whole answer, and it is worth repeating because forcing it is the natural instinct.
These are the signs that the valve needs attention rather than more effort:
- it will not turn, or only turns with real force;
- it leaks when you operate it;
- there is corrosion or staining around it or its connections;
- it turns but the water does not stop;
- you cannot reach it properly because of what has been built or stored around it.
A valve in that state is not a working safety device — it is an untested one that happens to still be in the pipe. Replacing it on a planned visit is a short job; replacing it mid-leak is not.
Read next
Who can replace a broken stopcock in Calpe?
The homeowner’s checklist
| Check | Qué hacer |
|---|---|
| Find it | Locate the internal stopcock before there is an emergency |
| Label it | So family, tenants or guests can identify it without you |
| Test it gently | Turn it carefully to confirm it still moves |
| Confirm it closes | Open a cold tap and check the water actually stops |
| Keep access clear | Do not block it with storage or appliances |
| Inspect for leaks | Look for drips, corrosion or staining around it |
| Tell others | Make sure the people who use the property know where it is |
| Book help if faulty | Call a plumber if it is stiff, leaking or ineffective |
Holiday homes and empty properties
This is where a working stopcock earns its keep, and where a seized one costs the most.
In a property that stands empty for months, there is nobody to hear a hose fail, a toilet run, or a pipe start weeping. The water keeps coming and nothing stops it until somebody arrives — which can be weeks. The usual culprits:
- washing machine or dishwasher hoses failing while nobody is there;
- a toilet running continuously;
- pipework failing after months of no use;
- a hidden leak building up behind a wall or under a floor.
Turning the water off at the stopcock when you lock up is the only measure that works on all four. It costs nothing and takes a few seconds, and it is the single most effective thing an absent owner can do — provided the valve turns, which brings us back to testing it.
The rest of the routine is in the plumbing maintenance checklist for holiday homes in Calpe and the Costa Blanca. And because hard water here works on valves as much as on boilers, how hard water affects pipes, boilers and appliances explains why a valve seizes here faster than it would elsewhere.
¿Cuándo hay que llamar a un fontanero?
Now
- There is an active leak and the valve will not close it
- You cannot find the stopcock and water is escaping
- The valve broke or started leaking when you tried to turn it
Book an appointment
- It is stiff, but nothing is leaking
- It turns but does not fully stop the water
- You cannot work out which valve controls the whole supply
- There is corrosion or staining around it
- It is blocked in behind storage or a fitted unit
If you are not sure how urgent something is, Cuándo llamar a un fontanero profesional covers where the line falls. And if a pipe has already failed, who can repair a burst pipe in Calpe is the one to read — starting with shutting off the stopcock.
Where a leak has no obvious source, locating it properly matters more than opening surfaces: see how to detect a slab leak before it damages your property y hidden water leaks and high bills.
If we are already on site, confirming your stopcock works takes a minute.
We offer our own comprehensive guarantee for the work we carry out.
Verified reviews from customers across the Costa Blanca.
We inspect, repair and replace stopcocks and isolation valves across the Marina Alta — see fontanería general, our full servicios de fontanería, y whether to repair or replace old plumbing pipes if the valve turns out to be the least of it.
Related Services
Calpe · Benissa · Moraira · Teulada · Benitachell · Javea · Denia · Jalon · Pedreguer · Ondara · Pego · Orba · and the rest of the Marina Alta
Frequently Asked Questions
What is a stopcock?
The main valve that controls all the water entering a property. Closing it shuts off the water to the whole building, which is what limits the damage when a pipe fails.
Which way do you turn a stopcock off?
Clockwise to close, anticlockwise to open — the same direction as a tap. Turn it gently by hand and never force it with a wrench.
Where is the stopcock usually located?
Under the kitchen sink, in a utility area, in a bathroom cupboard, in the garage near where the water enters, by the entrance or meter cupboard, or outside in a meter box. In apartments it may be in a communal service area or near the water meter.
Is a stopcock the same as a stop tap?
Yes, the two names are used for the same valve. In Spain you will also see it called the llave de paso, which is useful to know when describing it to a plumber or looking for it labelled in a service cupboard.
What should I do if my stopcock is stuck?
Do not force it. A seized valve forced with a wrench can break open, leaving water running with no way to stop it. Have it looked at while nothing is leaking.
Should every homeowner know where the stopcock is?
Yes, and so should anyone else who uses the property. Knowing where it is and that it works is what turns a burst pipe into a wet floor rather than a flooded house.
Can I turn off the water before going away?
Yes, and it is the single most effective thing an absent owner can do. It protects against failed appliance hoses, running toilets, pipework failures and hidden leaks that would otherwise run for weeks with nobody there.
Not sure yours works?
Go and turn it now, gently. If it will not move, or moves but does not stop the water, get it replaced while nothing is leaking — it is a short job today and a very different one in an emergency.
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