How to Install a Compression Fitting Seal on a Breville Dual Boiler / Oracle

BrevTech product graphic showing a white compression fitting seal beside a boiler hose connection.
Compare the replacement seal with your boiler fitting before you start.

Breville boiler repair

Replace a leaking boiler compression fitting seal.

Renew the seal, prepare a fresh hose end and refit the connection on a matching Breville Dual Boiler or Oracle boiler.

Buy the compression fitting seal

Where it applies

For Breville or Sage Dual Boiler and Oracle machines with matching newer compression fittings on version 2 or 3 boilers. Compare your connection with the photos before starting.

Time and purpose

Allow about 15 minutes. A seal compressed during tightening may not reseal after the fitting or hose has been disturbed.

Before you start

  • Unplug the machine and let the boilers cool completely before removing the cover or touching a fitting.
  • Keep freeze and release spray and any anti-seize compound away from electrical parts and the open water path; follow the product labels.
  • If the connection or model differs from the photos, stop and confirm the correct part before proceeding.

Tools and supplies

  • Replacement Teflon compression fitting seal; ferrule for refitting
  • Phillips and T20 Torx drivers
  • 15 mm spanner or sensor socket; optional impact driver for a seized nut
  • Large adjustable wrench; hammer if needed to help release a seized fitting
  • Wire cutters; sharp knife or suitable cutters for trimming the hose end
  • Wire brush for scaled threads
  • Optional for a stuck joint: freeze and release spray; screw and pliers for a stuck plastic fitting
  • Optional: food-grade anti-seize compound for external threads

Select any photo to see it at full size.

1. Open the machine

Keep the machine disconnected from power while the cover is open.

  1. Power down and cool

    Unplug the machine and wait until the boilers are completely cool.

  2. Remove the front screws

    Remove the two Phillips screws underneath the front panel.
    Underside of the machine front with two Phillips screw locations marked.

  3. Remove the rear screws

    Remove the two T20 Torx screws at the back of the top cover.
    Back of the Breville top cover with two Torx screw locations marked.

  4. Lift off the top cover

    Carefully lift off the top panel and keep it nearby for reassembly.

2. Free the leaking joint

Work on the leaking compression fitting shown by the matching boiler connection.

  1. Loosen the compression nut

    Scale can make this nut difficult to remove. A sensor socket with an impact driver can help release it. Alternatively, use a large adjustable wrench and tap it carefully with a hammer.

    Loosen the leaking compression nut with a 15 mm spanner or sensor socket.
    Leaking compression fitting on the boiler with a tool positioned over its nut.

  2. Free a stuck hoseOptional

    If the hose remains stuck after the nut is undone, apply freeze and release spray around the outside of the connection, then ease the hose out.
    Red spray straw aimed at the outside of a scaled hose connection on the boiler.

    Take care: Keep spray away from electrical connections and the open water path.

  3. Remove a stuck plastic fittingOptional

    If the old plastic fitting remains in the port, thread a screw into it and gently lever it out with pliers.
    Pliers gripping a screw threaded into the old plastic fitting at the boiler port.

    Take care: Do not damage the boiler port or its sealing surface.

3. Prepare the hose and seal

Remove the old sealing pieces, then give the new seal a clean hose end to seat against.

  1. Identify the old sealing pieces

    Locate the old ferrule insert and white seal at the freed hose end.
    Freed boiler hose showing its brass compression fitting, white old seal, and metal ferrule insert.

  2. Ease out the ferrule insert

    Gently pinch behind the ferrule insert lip with wire cutters and ease it out.
    Wire cutters gently gripping the lip of a metal ferrule insert in the old white seal.

    Take care: Grip only enough to move the insert; do not distort its shape.

  3. Remove the old seal

    Remove the old white Teflon seal from the hose end.
    Wire cutters lifting the old white Teflon seal from the boiler hose end.

  4. Slide the brass fitting back

    Twist and push the brass fitting down the hose, away from its end, to expose about 6 mm of clean, undamaged hose.
    Hand twisting the brass compression fitting back along the white hose, with an arrow showing direction.

  5. Trim the damaged hose tip

    Cut off the damaged hose tip to leave a fresh, smooth end for the new seal.
    Boiler hose with a six-millimetre clean section marked between the brass fitting and worn tip.

  6. Fit the ferrule and new seal

    Refit the ferrule insert and position the new seal at the fresh hose end as shown.
    New white seal and metal ferrule being fitted to the end of the boiler hose.

4. Refit and close the machine

Seat the hose and seal squarely, then close the machine before restoring power.

  1. Clean the fitting threads

    Use a wire brush to remove scale from the boiler fitting threads before reassembly.

  2. Apply anti-seize if desiredOptional

    If using food-grade anti-seize, apply it to the clean external threads.
    Bottle labelled Loctite LB 8014 Food Grade Anti-Seize.

    Take care: Keep compound off the seal, hose opening, boiler water path, and electrical parts.

  3. Seat the hose and seal

    Push the hose into the boiler port until it bottoms out and the new seal sits squarely.
    Hose and compression fitting seated at the boiler port, with an arrow indicating the brass fitting.

  4. Tighten the compression nut

    Tighten the compression nut with a 15 mm spanner or sensor socket.
    15 mm open-ended spanner tightening the compression nut on the boiler.

  5. Replace the cover

    Refit the top cover and reinstall both front Phillips screws and both rear T20 Torx screws before restoring power.

  6. Check for leaks with the machine closed

    With the cover and all screws refitted, reconnect power and run a normal test cycle. Check from outside for moisture or hissing. If you suspect a leak, switch off, unplug and let the machine cool before inspecting it again.

Final check

  • The hose end is clean, with the ferrule insert refitted and the new seal seated squarely.
  • The compression nut is tightened and the top cover and all front and rear screws are secured.
  • Normal operation with the machine closed produces no external moisture or hissing.
  • If a leak is suspected, switch off, unplug and let the machine cool before further inspection.

Parts and related guides

DIY repairs carry risk. If anything is uncertain, stop and consult a qualified technician. Read our full disclaimer.