Manual radiator valve allows you to alter the flow of hot water coming to your radiators - manually set the level by adjusting the valve. Lockshield valve helps you to balance pressure to your radiator from your heating system. Radiators further away from the boiler will need more pressure in the them to help pump water more efficiently.
Suitable for pipework coming through the floor or alternatively, suitable if your pipework runs along the wall and your chosen radiator has a side inlets.