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Discuss Bristan shower mixer leak in the Valves & Taps area at UKPlumbersForums.co.uk.

  1. Carl1

    Carl1 New Member


    My Bristan shower mixer (pictured) has a leak from the shower head. The amount of water seems rather pressure dependent, varying if you turn the shower on and off again, and if the tap or loo is used. A plumber replaced the cartridge some months ago, but the problem seems to have continued intermittently since then. What is it likely to be?


  2. Phil

    Phil Plumber

    Get him back, just because the cartridge has been replaced some showers can still drip as other O rings (depending on make) need replacing also.
    Like the Aqualisa ones, if you dont replace that O ring right at the back which is tricky to get out it can lead to a dripping showerhead even with a new cartridge.
  3. Shower Engineer

    Shower Engineer Plumber

  4. Carl1

    Carl1 New Member

    Thanks, Shower Engineer. Is the link you sent just to give an idea of what to search for, or are you confident that it will fit my exact model? I removed the controls (see image) if it helps. 20170520_172053.jpg
  5. ShaunCorbs

    ShaunCorbs Trusted Plumber GSR Top Contributor!!

    looks like a bristan quest exposed
  6. Shower Engineer

    Shower Engineer Plumber

    Yes they are the correct parts.

    1. Remove the brass nut and large plastic ring that operates the piston assemblies.

    2. Remove the blue and red discs by levering with a small screw driver.

    3. Undo the piston assemblies, this is the hard part. A tool was supplied with the mixer to do this, it is the blue part priced at £ 7.84 I linked to in my earlier post. You don't need the correct tool, I use a pair of circlip pliers inserted into the holes and turn that with a spanner. If they are very tight you can use a hammer and old screw driver to start turning them, not nice but effective.

    4. Make sure the stainless steel filter comes out with the piston assemblies.

    5. Use a 10mm Allen Key (a plastic one was supplied with the shower but is not much use so best to use a good one) to undo the small valve assembly at the back of the valve, make sure the Allen Key is a good fit, if you round this brass part off you have a real problem!

    Fit new valve assemblies and pistons, refit red and blue indices, reassemble the plastic ring and brass nut, refit temperature limit stop and control knobs and you are all done.