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QTZ25SE Daro Saphir 2 and 3 Replacement Quartz Sleeve

QTZ25SE Daro Saphir 2 and 3 Replacement Quartz Sleeve

QJ24479DE

In stock

£38.40 inc. VAT
£32.00 ex. VAT
£38.40 inc. VAT
£32.00 ex. VAT
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Product Description

The QTZ25SE is the replacement quartz sleeve for Daro Saphir 2 and Saphir 3 UV disinfection units, supplied by WrekinWater under part code QJ24479DE. It fits around the UV lamp inside these Daro units, keeping the lamp dry while allowing UV-C light through to treat the water. Replace it whenever the existing sleeve has clouded, scaled, or is due its annual change.

Compatible systems Daro Saphir 2, Daro Saphir 3
Sleeve material Fused quartz glass
End type Single ended (SE)
Manufacturer reference QTZ25SE / QJ24479DE
Vendor Daro
Pack quantity 1 sleeve

Signs your quartz sleeve needs replacing

  • The sleeve has turned cloudy or milky rather than staying transparent.
  • There is visible scale, scratching, or a brown film on the glass.
  • The Saphir unit's UV monitor is alarming even though the lamp is lit.
  • The sleeve has not been changed in around 12 months, the usual service interval.

Inside a Saphir 2 or Saphir 3 unit, the quartz sleeve is the only barrier between the UV lamp and the water flowing past it, and it needs to stay both watertight and optically clear. Mineral scale from hard water and general fouling build up on the outside over time, while the quartz itself can dull with age and cleaning. As transmittance falls, less UV energy reaches the water even though the lamp continues to light and draw power as normal.

WrekinWater has been supplying water treatment parts, including Daro spares, to more than 50,000 customers over 15 years from its base in Bettisfield, Shropshire. Ordering the QTZ25SE ensures you get the sleeve matched to your specific Saphir 2 or Saphir 3 unit, from a family-run supplier rated Excellent on Trustpilot.

How to replace it

  1. Isolate the water supply to the Saphir unit and disconnect the power.
  2. Undo the retaining nut at the single end of the housing and withdraw the UV lamp first.
  3. Slide out the old QTZ25SE sleeve and clean any scale from inside the housing.
  4. Fit a new O-ring and Teflon washer before inserting the replacement sleeve.
  5. Refit the UV lamp and reassemble the retaining nut, taking care not to overtighten.
  6. Restore water and power, check for leaks, and run to drain briefly before normal use.

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QTZ25SE Daro Saphir 2 and 3 Replacement Quartz Sleeve

QTZ25SE Daro Saphir 2 and 3 Replacement Quartz Sleeve

£38.40 inc. VAT
£32.00 ex. VAT
£38.40 inc. VAT
£32.00 ex. VAT

Frequently asked questions

For full details on returns, refunds, eligibility, and timeframes, please refer to our complete Refund Policy here:

👉 Refund and Returns Policy

If you are unsure whether your item qualifies for return, please contact our team before sending anything back and we’ll be happy to help.

Yes, the QTZ25SE is the correct quartz sleeve for both the Daro Saphir 2 and Saphir 3 models, which share the same single-ended sleeve fitting.

Yes, it is good practice to fit a fresh O-ring and Teflon washer whenever you change the sleeve, since the old seal has already been compressed and may not reseal reliably.