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28.7 MB (611.9 KB compressed)
2592 x 3872 pixels
21.8 x 32.8 cm ⏐ 8.6 x 12.9 in (300dpi)
STEVE HORRELL / SCIENCE PHOTO LIBRARY STEVE HORRELL / SCIENCE PHOTO LIBRARY
Thermostatic radiator valve (TRV) on a domestic radiator. TRVs adjust the temperature output from a radiator by sensing the air temperature around them and regulating the flow of the water through the radiator.
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