JG Speedfit lockshield radiator valve is used to switch off a radiator for installation or maintenance and can be used to balance radiators in the system so that they all heat up at the same rate. The JG Speedfit lockshield radiator valve is quicker and easier to install in confined spaces than traditional methods as it eliminates the need for hot works or tools. Lockshield radiator valve with a tamperproof cap Fast and simple tool-free connection Safe flame-free installation, with no hot works, glue or flux Grip & Seal collet with stainless steel teeth and main O-Ring seal Compatible with Speedfit PEX and polybutylene plastic pipe (inserts required) and copper pipe Suitable for central heating systems