Derry Bold - Thermostatic Radiator Valve & Lockshield - White

This specific set is engineered for 15mm pipework and will not fit 10mm pipes without appropriate reducing adapters.

Yes, as long as your radiator has a standard 1/2 inch BSP connection point.

Yes, the kit includes both the thermostatic valve and the lockshield valve required to control a single radiator.

This is a straight valve set, designed for pipes coming directly out of the floor.

TRVs do not have a specific expiration date but should be replaced if they no longer respond to temperature changes or if they begin to leak.

Check if the thermostatic pin is stuck. Remove the head and gently press the pin to ensure it moves freely; if it remains stuck, use a penetrating oil or replace the insert.

Ensure the connection is tightened to the correct torque using proper plumbing tools and verify that the olives are properly seated on the pipe.