A set of metallic door lock center cases and gearboxes, typically used in multipoint door lock systems.
Diagram illustrating how to measure a Mila uPVC door lock centre case gearbox, showing the "Backset" (A) and "PZ" (B) dimensions for correct fitting.
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A set of metallic door lock center cases and gearboxes, typically used in multipoint door lock systems.Diagram illustrating how to measure a Mila uPVC door lock centre case gearbox, showing the "Backset" (A) and "PZ" (B) dimensions for correct fitting.

Fullex XL Gearbox – Replacement Centre Case for uPVC Multipoint Door Lock – 35mm or 45mm Backset 92mm PZ

FullexSKU: HS5857
162 reviews from verified buyers
Price:
£38.99

Key benefits

  • Direct Fullex replacement - matches the model in your door
  • Restores multipoint lock function - saves replacing the full strip
  • Check the model on your existing case - before ordering they vary

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Description

Fullex XL Replacement Gearbox

The Fullex XL centre case gearbox is the mechanism inside your uPVC door that is operated by the handle. It is the part most likely to fail when a multipoint door lock stops working.

Replacing just the gearbox is far more cost effective than buying a complete new lock. The centre case re-attaches to your existing locking strip.

Key Measurements

The most important measurements are 35mm or 45mm Backset and 92mm PZ.

This gearbox is non-handed, fitting both left and right-handed doors. Available for single spindle, split spindle or dual spindle operation.

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Frequently Asked Questions

The Fullex XL gearbox is the main internal mechanism in a multipoint door lock. It controls how the handle and key operate the locking points, ensuring your door locks securely.

Signs include a stiff or floppy handle, difficulty turning the key, or the door not locking properly. These issues usually indicate internal wear and should be addressed quickly.

No, compatibility depends on measurements such as backset, PZ centres, and the overall lock design. Always compare your existing gearbox before purchasing a replacement.

Yes, if you have basic DIY skills, replacing a gearbox is usually manageable. However, correct alignment is important for smooth operation and long-term performance.

Multipoint locks secure the door at several points along the frame, improving both security and sealing. Learn more in Beginners Guide to uPVC Door Locks.