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brass automatic drain water valveMax. working pressure:10 barAmbient temperature range:-30–90°COpening temperature:4°CClosing temperature:8°CAccuracy:±2°CConnections:G3/4" or NPT3/4"Body material:BrassThread:Male threadNet weight0.14 KGSGross weight0.15 KGS Operating principle:When the water temperature below 8?. This causes the sensor to move and open a tiny passage so that water can drain out, this prevents water from freezing inside the pipe. When the temperature below 4 ?,the valve opened completely. The water will be flow out from the solar panel . When the temperature above 8?, the valve