... 2012 tope sale solar super heat pipe thermal collectors with new design(SRCC,CCC,CE,ISO,CGC,Keymark ... for exterior ,red copper for interior ,also with fashion design3.Withstand high pressure when it is ... freezing >-35°C Red copper Pressure: 6 bar Insulation: 50mm of high density polyurethane foam or rockwool ... 2012 tope sale solar super heat pipe thermal collectors with new design(SRCC,CCC,CE,ISO,CGC,Keymark ...