... alloy 3) Glass tube: new trivalent element heat tube4) solar working station5) Steel tube dimensions: 58mm x 1.8m, ... types:SCM12-58/1800SCM15-58/1800SCM20-58/1800*************New Solar Keymark certificate types:SR10-58/1800SR15-58/1800SR20-58 ... *2702*1940*350*180certificateEN12975-1,2 SOLAR KEYMARKEN12975-1,2 SOLAR KEYMARKEN12975-1,2 SOLAR KEYMARK Material vacuum tubehigh borosilicate glasssize58 ...