The TRV4 Classic has achieved the highest Class I rating for energy efficiency under the certification scheme of the European valve manufacturers association (TELL). The rating is based on how quickly a TRV reacts to changes in room temperature; how effectively it maintains stable room temperature; and how it performs after changes in water temperature and system pressure. Britain's best loved TRV4 range of thermostatic radiator valves, Drayton's TRVs set the standards for design, performance and quality. The range includes Lockshield and Pushfit packs to suit most domestic and commercial heating systems. * Contemporary slim-line design * Ultra sensitive liquid-filled sensor * Easy to clean smooth surfaces * Half/full click stop settings * Frost protection position * Flow rate adjustment * Complete with chrome valve * Non-stick internals * Pre-setting * Double gland seal * Warranty: 18 Months Drayton TRV4 Classic Thermostatic Radiator Valve 15mm Angled with Lockshield in White/Chrome Brass. Drayton TRV4 has been designed to offer years of trouble-free service. Its valve internals is made from a material specially formulated to prevent a build-up of lime scale which can cause the Thermostatic Radiator Valve (TRVs) to stick. All Drayton two pipe bodies come with pre-setting internals as standard, which makes system balancing simpler and more accurate. Britain's best selling range of thermostatic radiator valves set the standards for design, performance and quality, including TRV4 lockshield and pushfit packs to suit most domestic and commercial heating systems. Ultra sensitive liquid filled sensor Contemporary slimline design Half and full click stop settings Contains TRV4 + lockshield valve Temperature-range limiting feature 1 to 5 setting numbers and frost protection at 8°C Temperature setting range from 10 to 30°C for flexibility in setting comfort levels and energy efficiency Non-stick valve internals Hygienic wipe clean surfaces, no dust traps Radiator can be balanced from the TRV using Presetting Key 07 35 162.