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If you find moisture
Sensor may look different to the picture in the listing
generating steam and unnecessary stress to the solar systems
Delivery head
AVG Hot Water Expansion PTR Valve 15mm Blue 850KPA Compatible_Thermann If you find moistureHot Water Expansion PTR Valve 15mm Blue 850KPA The Pressure and Temperature Relief valve (PTR) is designed to relieve the increase in pressure caused by water expansion during the normal heating cycle. The valve will then relieve the increase in pressure by releasing drips of hot water to the drain line. Should the electrical temperature cut out device cease to operate correctly, the water will overheat. The temperature probe will then open the PTR
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