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A spark plug (sometimes, in British English, a sparking plug, and, colloquially, a plug) is a device for delivering electric current from an ignition system to the combustion chamber of a spark-ignition engine to ignite the compressed fuel/air mixture by an electric spark, while containing combustion pressure within the engine. A spark plug has a metal threaded shell, electrically isolated from a central electrode by a ceramic insulator. The central electrode, which may contain a resistor, is connected by a heavily insulated wire to the output terminal of an ignition coil or magneto. The spark plug's metal shell is screwed into the engine's cylinder head and thus electrically grounded. The central electrode protrudes through the porcelain insulator into the combustion chamber, forming one or more spark gaps between the inner end of the central electrode and usually one or more protuberances or structures attached to the inner end of the threaded shell and designated the side, earth, or ground electrode(s).
Spark plugs may also be used for other purposes; in Saab Direct Ignition when they are not firing, spark plugs are used to measure ionization in the cylinders – this ionic current measurement is used to replace the ordinary cam phase sensor, knock sensor and misfire measurement function. Spark plugs may also be used in other applications such as furnaces wherein a combustible fuel/air mixture must be ignited. In this case, they are sometimes referred to as flame igniters.

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    Hello everyone, Baxi Ecoblue System boiler which was recently serviced just before Christmas. There has since been a constant but slow drip coming from the black nylon plastic drain plug at the back of the boiler which is accessible from the underneath. It does not appear to be from the thread...
  2. L

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    Do I need a washer for blanking plug in a copper hot water cylinder?

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  4. B

    Wash Basin Plug (options)

    HI, I'd very much appreciate advice on what I can do with this . . . The wash basin in the bathroom has a plug which sits on a piece which is opened and closed by pressing down or pulling up a lever behind the tap and that had consistently failed as the adjustment gets misaligned so I would...
  5. M

    Flip top plug stuck! Please help - any ideas!??

  6. D

    Installer Plug casing for UPS3

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  7. E

    Pop Up Bath plug sticking

    Hi Our pop up bath plug is sticking, looking for suggestions to fix it please. Wondering if WD40 might stop it sticking or will I need to replace a part? Many thanks.
  8. P

    Where can I buy this bath plug?

    Hi, I have removed a seized bath plug from my bath, but would like any advice about how to go about finding a replacement. Please see attached photos. It just sits in the plug hole. The mechanism is spring loaded. If you push it down, it closes the hole and the top disk sits flush against the...
  9. A

    Newbie question, replace a depresser plug in a sink

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  10. M

    ID of a kitchen strainer plug? Help, stumped!

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  11. W

    How to fix Pop Up Plug

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  12. N

    Name of this plug please

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  13. G

    Kitchen strainer plug

    I have a double sink, and the small sink is about 29cm x 15cm, and 12cm deep. When filled, the water slowly drains away. I tried a simple rubber plug, and the water does not drain away. This sink is not used much, so I don't think that it is down to wear. The plug is the original plug that came...
  14. N

    push up plug stuck

    Hi all, My push up plug in the bathroom sink is stuck. Please can you let me know if you are able to fix it and how much it will cost? I am in the Purley (near East Croydon) area. thanks, Nav
  15. N

    push plug stuck

    Hi all, I have a push up plug in my bathroom sink. It is now stuck and I have tried a few options. It really is stuck and I wonder what I should do to get it fixed. Any ideas how much it will cost me to have it fixed, if I am not able to do it myself? Thanks, Nav
  16. T

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  17. B

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  18. M

    Replacing pop up plug and waste in bath. No screw to remove drain cover from plug hole.

    Hi, the pop up plug system has broken and needs replacing. I would like to replace the whole lot. My issue is trying to remove the waste drain cover from the bath isn't what I'm expecting. There is no screw holding the trap to the plug section in the bath. As the bath is fiberglass, I don't want...
  19. P

    Replacement plug

    Hi there, We have a pop-up waste in our bath, one where you twist to open and close the plug. The plug is badly rusted (please see attached pic) and it is no longer opening and closing properly. Is it possible to replace the part in the attached picture, or do we have to buy a whole new waste...
  20. B

    Plastic drain pipe screwed access plug removal

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