– [Voiceover] Honest reviews and advice. – Hold tight and welcome to today’s video. Today we’re gonna be having a quick look at this world. The world of stop cocks. It’s not gonna be a very long video. But we’ve been requested by someone who said earlier on that their stop cock, when they turned it off, basically wouldn’t turn off the water. So it’s very very similar to a tap washer change. But also what we’re gonna do is look at, sometimes the leak that
you get on a stop cock, the gland leak you get. And also the importance of actually working these every so often. So I hope this video is gonna give you a little bit more insight into how stop cocks work, what you should do to them periodically to make sure that they still work and if they do fail, how easy they are to fix. But before we begin, if you haven’t subscribed, please click on the subscribe button that you can see flashing
up in the corner now and let’s get on with the video. See you in a sec. So without further adieu, let’s go into the world of the stop cock. Hold tight. Now the first thing you want to have a look at is that these have an arrow on them to denote which way the
water must come through. So your mains water coming from the road or wherever it is, will go into this hole here and come out at that hole there. So always take not of that arrow. Secondly if we have a look inside here, we’ll just pop it down in the vice so you can get a really really good look. You can see what happens when I twist this knob inside and out. So you should be able to see here as I twist this inside and out, can you see that just inside here you can see that jumper up and down. So what we’re gonna do is gonna open this up in a sec and you’ll be able to see exactly how this creates a water tight seal and shuts off your water. All the things you said, All the things you said, running through my head, running through my head, running through my head. So when you work on one of these to see what you need to do, there really really easy. Make sure for a start that it’s undone but not fully. So we just undone like so. And the you can get a
nice adjustable on here. Often obviously you’re not gonna have one of these in a vice, you’d have a pair of
grips holding the body. This bit can be really really tight. And it’s the first part of any of the problems that you
might have in a minute. So we’re just gonna give
that a good old pull. So first thing we’ve got
our fibre washer here. Now what this does, this sits on this collar here and creates a water tight seal when you tighten this
thread up on to there. Now that’s the first place that some of these can actually leak. The thing you want to do is, often is you’ll find that the fibre washer’s even fallen apart and you might need to get a replacement. Often what people will do though, is they’ll wrap a load of PTFE around here and then pop that back in. The problem about that is it doesn’t quite lock the fitting like a fibre washer would. So if it’s actually being worked inside and out, this bit can actually come untwisted and actually come out of the valve and create even more of a problem. A lot of the time also people can put rubber washers on there and bits of PTFE. But I’d always recommend trying to replace this fibre washer. This bit here is super important. This is a rubber washer. Now when one of you guys messaged us in and said to us, my stop cock, when I turn it off, water seep keeps coming out. The first problem that you’re gonna probably find is that this rubber washer has basically fallen apart completely and isn’t very happy anymore and is basically letting water through. And it isn’t creating a water tight seal on to the metal bit that you saw a minute ago. But if we look at it from above, it looks a little bit like this. So if you look closely you’ll see that our rubber washer presses down on this little flat of metal here and if that’s got any nicks in it as well, then you need to use a tap re-seating tool to grind out that brass and make that nice and flat again. We did a video about how to reseat taps about five years ago when I was probably about two stone heavier. And yeah had more hair. So I’ll leave a link to that in the description below and you’ll be able to see how that works there. The great thing is about this part though, is if it is the rubber washer it’s really really easy to change. You can just pop it off like so and pretty much just pop
a new rubber washer on. I’ve got a set of tap washers here. You can get these from all
different line suppliers. But you’ve got loads of different type of tap washers there. So that’s really really good. The last thing I want
to quickly look at is that sometimes these cold water stop cocks get a little bit of a leak on them. And it’s usually on this gland here. I get called out on this no end of times. Usually all you need to do is just nip this gland up, that’s all, by a quarter of a turn or whatever and that will do it. But before we put this
piece back together here, I’ll just show you what you can do if you find that it’s leaking between this part here and this part here. You’ve obviously got to go and turn your water off out on the road. You’ll find your water stop cock is usually out in the path or out in the road. So now what we do is
just get a bit of PTFE, just like this, and we’ll wrap that around
this part here like so. Then as you can see you’ve got a nice little wrap of PTFE around here. Then obviously if you’ve still got a fibre washer nearby
you can use that as well. And you’d pop that on here like that. And give that a good nip up and then you should find that’s not gonna leak there anymore. Now with these here, if you do find that you keep tugging it up and the gland just keeps on leaking, you can actually almost do the same thing. So if you’ve got a leak out the gland here you’ll always find there’s a little bit of a drip there. You can undo this piece here and sometimes if you’re lucky you can actually take this piece of handle off. But if you’re not lucky you can still get a bit of PTFE and wrap that around there a few times and then pop that back in. But usually you won’t need to do that. Usually it’s just a matter of getting a pair of adjustables and give it a nice nip up like so and then that should stop any leaks and any problems that you have. Obviously you’re gonna need to know where your stop cock is out on the road or in your garden or
outside of your premises, to be able to do any work to the stop cock inside your house. You usually find these stop cocks under your kitchen sink. But really they could be anywhere installed by the engineer when they were built or when the place was installed. It can be very very
difficult to find these. If you can find an old drawing where they then great. Often as well you’ll find that your stop cock outside has been either paved over or someone has put a load of gravel over. Or even if it’s been snowing, if you don’t know where it is, it might be very difficult to find and that’s kind of the sixth sense thing that you get when you’re a plumber. You just somehow find out where they are. You think ahh it could be over there. So that can be also a problem if you’re trying to isolate the water supply to a stop cock before you even do any work to it. Once you’ve found your stop cock and you’ve worked it on and off and you find that it’s working fine now, or there’s no leaks, I’d recommend that once every month or once every couple of months, just go in there, wind it shut and wind it open. And then when you wind it fully open give it another quarter of
a turn back closed again. The reason you do that is because if it does get seized up, you’ve then got room to wiggle it one way or the other. If you have it wound right back they can usually get stuck
up in the open position or stuck in the shut position and you get major problems like that and even more hassle. So they might be simple things. You might look at it
what the hell is that? I’ve never gone near it in my life. But hopefully having watched this video you can think oh I should probably go near that and do something to it. Make sure that it works okay, make sure that it works fine. If you want anymore help or anymore information, if you need to know anything more about stop cock valves or anything like that, please visit our website As I said please subscribe to our videos. And you can follow us
on Twitter and Facebook where we upload loads of pictures of plumbing disasters and video questions that you guys have had throughout the week. And hopefully some of the plumbing fraternity at Plumber Parts, the people who follow us, which is getting over 30,000 people now, will help you out with
your plumbing problem. Anyway until our next video, I hope to see you then and remember everyone, to hold tight. See you later. I’m gonna go outside now because it’s sunny out here. Oh Look at that. Right. See you later everyone. Hold tight. – [Voiceover] honest reviews and advice.


  1. Hey there @Plumberparts just wanted to say thank you on your vids, im a second year apprentice from melbourne australia and have been watching your videos since day one and will continue watching long after i am qualified ☺?

  2. Watching vids from 5 years ago, I am struck by how darn polite PP was back then. Not the plumbing lout of today waving his cock around!

    Keep up the good work!

  3. Hi plumberparts I want to ask, what should I do if my main city water supply comes into my house's basement and it goes into the first stopcock, before the water meter. That stopcock is one of those really old soviet made iron ones, and it is so freakin rusted, that when I tried to twist it, thus to shut off water mains to my house, the handle twisted off itself, but the whole stopcock didn't shut off, the main arm that sticks out from the top twisted off and there 's now nowhere to grip and shut it off, and after that it starter to leak. What should I do? I tried to ask my city's goverment to shut off the water at the street, thus shutting water to all 10 apartment blocks and 60 private houses in the street, they said that they can't do this, because the main street can't be shut off, because of some sorts, so what can I do? If I try to touch anything, it will start to leak badly, and if I leave it as is I am at risk that 100 year old plumbing in my house will some day erupt and I will be in a lot of trouble, so what should I do?

  4. Why everyone in England is using the crank-stopcock? If this is under the house, it will not be cranked at least one time in month. And this will cause it to stuck in open position and when you will try to crank it, even pliers will not help you, because the gland and the shaft will be coroted in place, and the sealing washer will be hard as a rock. I think everyone should be useing a ball-valve, witch has a rotating ball inside, and to shut it off you only need to twist it quarter turn. Those crankcable stopcock are designed to be used in gardens, basements, for water pumps etc. because they need to be cranked all the time, or it will stuck. For places, where you will not touch the valve for years you should use a ball-valve. Those can stay open for years and you will still be able to turn it off easily if you need.

  5. As I wrote in my previous comment, I had a trouble with my stopcock, but I fixed it (hell it was) and now I am remaking all plumbing in my house, and what I found made me laugh my ass off – I found cold pipe that run below the ground where the toilet was, and the plumber back then probably ran out of tees, so he used a STOPCOCK body as a tee for a toilet pipe 😀 how redicilous is that?

  6. I live in a ground floor flat and I've turned the stopcock underneath my kitchen sink off which turns off the water supply only to the cold water taps and bath. there is still water coming out of the hot taps??? I thought the stopcock in the kitchen turns off all the water in the property?
    How do i turn the hot water supply off ?

  7. Can you suggest a solution to my stopcock problem please? I turned my stopcock off and went on holiday for one week. When I came back, I turned the stopcock back on. Water ok for a couple of hours but then pressure dropped down to nearly nothing. Turned stopcock off then on again. Water came back good but really really noisy, pressure good then dropped off again. Prob with stopcock internal washer not fully opening? What can I do?

  8. In my airing cupboard there is water dripping on the pipes i have phoned my local home group repairs the plumber man has come out 4 times all he done was put ptfe tape round the stopcock and used the spanner to tighten it up at the bottom of the pipes were the water is dripping. I don't think the plumber man thought about the fiber washer and rubber washer needs replacing. I think that might be the problem :/

  9. I live in 60s property and the stopcock beneath the sink has seized up. I can screw the top gland out and slide it to the top of the spindle yet no water leaks out .Why is this?.Would spraying WD-40 help loosen the seized stopcocks.If so where should I spray it.Your advice would be appreciated.Thanks.

  10. Well done, a great video, i like it a lot, informative, fun, and i have learned so much, my stopcock was leaking, put some ptfe tape around the gland, and from full position turned it back a quarter of a turn. What i find is that if you use the stopcock often, to open it, it loosens the gland nut, as it is the same away to loosen it. then you might get a drip.

    Plumbing is hard work, and they earn every penny, especially for a DIY person, there are many DIY people who have to call a pro out, like this guy. These tips can help to prevent, a lot of problems. Thank you.


  11. Lucky you foamy! ive had no mains water in the town for the last few hours! Im aiming to be squeeky clean tomorrow for you hopefully! Dirty dreams ???

  12. Links to the tools I use everyday here:

    Plus, follow my Vlog “TimesWithJames”:

  13. Thank goodness for videos like this. I had a leaky gland which (I have now learned) needed simply tightening up. Saved me a load of time and effort working it out. Thank you.

  14. Think you’ve misnamed this video it should actually be how they don’t work cause they always fucking seize and when you use a shifter it leaks they’re a nightmare

  15. So what do you do if you cant find a outside stop cock and the indoor stop isnt turning water off

  16. Was trying to follow you instructions, but I wish you could slow down a little and go thru everything step by step.

  17. From the road mains is a lead water pipe connected to the stop cock under the sink at the back of my house. Could I re route a new 25mm water pipe from the mains to a new stop cock on the outside side of the house? Or do I have to go under the house creating mayhem? The water company claims u have to pay for this even though they placed this lead pipe in in the 1980s, and I pay a service charge etc!


  18. Thank you so much. My stopcock started leaking, I couldn't stop it, and I was almost at the "DON'T PANIC!" stage; but a quick nip with a 16mm spanner on the gland fixed it. I'm so relieved. Thanks again.

    On the singing……it's horrible, true, but I reckon you've earned the right.

  19. Your should never attempt any plumbing unless you know what your doing , it seems to me the guy on vid is , but many off the joe blogs public are not , so it’s seems that the 5 year apprenticeship I did and intensive training I went through is worthless then according to this guy , because anybody can do what I do then . It dilutes my trade and hurts plumbers in general , I carnt tell you how many jobs I’ve been to where joe public have done diy plumbing themselves , and it’s cost them more because I’ve had to out and put it Wright , this guy is promoting his own interests and diluting the trade I love

  20. Hi James.

    When loosening the gland to wrap PTFE below for packing. Can I leave the stopcock open or does it have to be closed?

  21. thankyou nearly got flooded with these old fashion pipes and this useless couch potato lump of lard ive got no help,,,,so thankyou saved my day,,,,,

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