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50*1800mm Vacuum Tubes for Solar Water Heater, Find Details and Price about Solar Evacuated Tube and Evacuated Tube from Shandong Longguang Tianxu Solar Energy Co., Ltd. Featuring High Absorptivity Coating: Cu/SS-AIN(H)/SS-AIN(L) coating achieves 0.93~0.96 absorptivity for maximum solar energy capture.