... rings UV stabilized high temperature silicon rubberTest pressure:10 barCollector mounting flat roof/inclined roofMounting angle:15-50CInlet:3/4"E Solar collector ... )SC-H seriesModelSC-H-15-5818SC-H-18-5818SC-H-20-5818SC-H-24-5818SC-H-30-5818Length of Tube1800mmOuter Diameter ... ,Vacuum Degree,P<=5*10-4,Service Life,10 years Mounting FrameAluminum Alloy,Thickness,1.8 mm, not have back-leg ...