Product Name:Non-pressurized project solar collector Model:YYJ-E01 & YYJ-E02 Circulation Type:Indirect / Open Loop (Active) Heating System:Thermosyphon (Passive) Connection Type:Direct-Plug Descripition Non-pressure solar collector Material of inner tank SUS304-2B food grade stainless steel with thickness 0.4mm Material of manifold tank stainless steel/galvanized steel/brushed steel Tank insulating layer 40mm 50kg/m3 high-density polyurethane foam Inlet and outlet hole Male G 1’rsquo/NPT1’ Solar collector tube 3.3 Borosilicate glass with ALN coating http://www.ejiasolar.com/