Detailed Description: 1) Reliable and efficient with twin-tube solar glass 2) Easy plug-in installation 3) outside the box material: color steel plate board 4) reliable and efficient double-glass solar tubes 5) Easy plug-in installation 6) outside the box material: color coated steel powder 7) Liner Material: 0.4 mm thick 304 grade stainless steel plate of food 8) Frame material: color steel plate 9) High insulation to ensure that 50 - 65 mm polyurethane foam insulation also pull |