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A leak is a way (usually an opening) for fluid to escape a container or fluid-containing system, such as a tank or a ship's hull, through which the contents of the container can escape or outside matter can enter the container. Leaks are usually unintended and therefore undesired. The word leak usually refers to a gradual loss; a sudden loss is usually called a spill.
The matter leaking in or out can be gas, liquid, a highly viscous paste, or even a solid such as a powdered or granular solid or other solid particles.
Sometimes the word "leak" is used in a figurative sense. For example, in a news leak secret information becomes public.
According to ASTM D7053-17, water leakage is the passage of (liquid) water through a material or system designed to prevent passage of water.

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  1. T

    Stopcock turned tight but water still running upstairs. Help!

    Hi all, thank you so much in advance for any help. I’m always really grateful for the advice and support from experts when I have been on here a few years ago. There’s a dripping coming from my bathroom and I can hear it coming from behind the toilet and I’m worried it’s causing a buildup which...
  2. L

    Internal plastic pipes

    Hello Please could I have some advice. I recently had an new air source pump and hot water tank system installed. The pipes to the radiators are copper. However, there is plastic pipes to the taps for hot and cold water. I have found a leak in the connection of a plastic pipe. First...
  3. S

    Leak between bathroom sink plug and waste pipe

    I've attempted to replace the waste plug but couldn't get the nut undone but not the sink is leaking at the waste pipe connection. I've unscrewed the large white cover and where the pipe connects with the metal sink part it is leaking, I separate the 2 parts - would plumbers mate work or is that...
  4. M

    URGENT Leak on the pipe / wall junction

    Hello all, I realised yesterday that I now have a massive leak coming from the where the pipe below the sink goes into the wall. Every time water is used (sink, washing machine, dishwasher), it leaks from the junction of the pipe / wall. You can see on the pictures that there is some gross...
  5. chloeradhsaw

    Baffled By Cylinder Hot Water Draw Whilst Cold Water On

    I had my indirect hot water cylinder removed a few days ago and the central heating boiler and pump is turned off at the fuse spur right next to the boiler. I have been without hot water for a few days which is fine - The plumber left the flow / return to the cylinder uncapped as well as the...
  6. D

    Best options for finding a CH pressure leak

    I have a pressure leak on my CH system. Our piping is buried in the walls (maybe a mistake) and the room-to-room pipes are now covered by flooring making it difficult to detect any leaks if there is no yellowing happening on the ceilings below. We have noticed that we need to top up the system...
  7. M

    Internal pipe leak - could dripping continue after water turned off?

    I have a growing damp patch on my ceiling, I initially assumed it must be from the empty flat above (and therefore cannot gain access), and have since used emergency cut off for that flat. I'm now wondering if it could a problem in my own flat, so cut a hole in the damp patch to investigate -...
  8. Q

    Is this a possible leak?

    I have purchased a thermal camera as my valliant engineer has stated that there is a leak in the property. Struggling to find it however the images attached from the kitchen look suspect. Any advice welcome.
  9. S

    Leak from where tail screws into tap.

    Hi, One of the tails for our basin tap was leaking slightly; I was never sure if the leak was from the flexible or from the join to the tap. The flexible tail in question had been screwed in so tightly that the braiding was damaged in several places. A real struggle to get the old tails out, but...
  10. A

    Leak in shower tiles?

    Hi everybody, I have a shower and it looks like there is a leak somewhere (circled area). I put a bit of blue tack on to see if water is tracking along the tiles. It could be a slight gap between the shower unit and the tiles - how do I seal this? Thank you :)
  11. Teleri

    Kitchen sink plug hole/waste pipe leak

    Hi there Could someone help identify the waste pipe (think that's what it is) coming from the bottom of the basin/plug hole, feeding into the other pipes? It has a leak where it connects to the bottom of the basin, so I'm thinking about replacing it if it's a standard part. If so can you tell...
  12. W

    do i require heat leak radiator

    connecting free standing woodburning stove to indirect cylinder, by gravity, do i need to fit heat leak radiator?
  13. S

    Danfoss Lockshield valves leak after adjusting

    Heating system is 14 years old. On inspection I find that every lockshield valve is fully open. After adjusting some, I find that they weep slightly from the adjustment screw - valve type is as in attached picture, with only the adjustment screw behind the cap. Leak sealant is in the system - do...
  14. HollyDB

    Intermittent Gas Leak

    Hello, What would cause an intermittent gas leak around a boiler? In the evenings there is a strong smell of gas coming from the boiler. I got a gas sniffer from Screwfix and it detects gas in the kitchen and squeals when near the boiler. A plumber inspected the boiler, in total they...
  15. samdporter

    Leak - pan connector from cast iron stack

    Hi all, We've got a toilet that's been leaking due to a faulty seal with the pan connector. We've had a plumber in to replace the pan connector, but it hasn't done anything to fix the leak (and has cost us over £200). The plumber has told us that it can't be fixed due to the height of the old...
  16. A

    URGENT How to fix leak with too much ptfe tape

    Both Tiny leak on bot new fits on the metal nuts. Did i use too much ptfe tape. I used 2 wrap arounds. The nuts won't tighten anymore. Could i remove the exposed ptfe tape and if so would the nut then continue to tighten and is this a ok thing to do. I should have used 1 wrap around i know now.
  17. C

    Showerhead leak query

    Hi I have a shower that is fed from the cold water and hot unvented water. It is not used at the moment (there is also a bath) but to take it out would have both cost and affect tiling so I am leaving it until more funds available for a full bathroom refurb. If the shower was to develop a...
  18. I

    Accessing concealed cistern toilet to investigate leak

    Hi all Relatively inexperienced homeowner here. Apologies in advance if I get any terminology wrong. Today I noticed some limescale accumulation on/around the grout between the floor tiles next to my toilet. I realised that the grout line right next to the toilet was in fact wet to the touch...
  19. T

    New sink flexible hose nut leak at fitting.

    Hello , Should i tighten more or should i buy pulmber tape or its not that bad to leave like this permenantly? Thanks.
  20. B

    Glow Worm Flexicom 30cx Intermittent leak

    Hi Have a Glow worm Flexicom 30cx-Installed 2010 and regaularly serviced. Last service October 21. Works fine, with no issues. However it has started to leak-though never when the house. is occupied. Went to Scotland over hogmanay for a week and when we returned there had been a leak of...
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