Three metal door lock gearboxes laid out on a white surface, with varying amounts of visible dirt and markings.
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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Three metal door lock gearboxes laid out on a white surface, with varying amounts of visible dirt and markings.Diagram illustrating how to measure a Mila uPVC door lock centre case gearbox, showing the "Backset" (A) and "PZ" (B) dimensions for correct fitting.

GU New Style Gearbox – Replacement Centre Case for uPVC Multipoint Door Lock – 35mm Backset 92mm PZ

GUSKU: HS3286
162 reviews from verified buyers
Price:
£35.99

Key benefits

Direct GU New Style replacement - for newer GU multipoint doors

Restores multipoint lock function - saves replacing the full strip

Standard GU dimensions - measure your case before ordering

100% SECURE PAYMENTS

HASSLE FREE RETURNS

FULLY TRACKED DELIVERY

Description

GU New Style Replacement Gearbox

The GU New Style centre case gearbox is the mechanism inside your uPVC door that is operated by the handle. It is the most common part to fail when a GU multipoint door lock stops working.

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

Key Measurements

The most important measurements are 28mm or 35mm Backset and 92mm PZ.

This gearbox features a reversible latch and is non-handed, fitting both left and right-handed doors.

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Frequently Asked Questions

The GU gearbox is the central mechanism in a multipoint locking system, responsible for controlling the handle and key operation. It ensures all locking points engage securely along the door.

Common signs include a stiff or loose handle, difficulty turning the key, or the door not locking properly. These issues often indicate internal wear within the gearbox.

No, compatibility depends on factors such as backset, PZ centres, and the specific lock configuration. Always check your existing gearbox specifications before replacing it.

Yes, in many cases the centre case gearbox can be replaced on its own, making it a cost-effective way to restore your door’s functionality.

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.