1,3 years guaranteed 2,Material:ss304 ,brass or ss nuts, PVC/PE coated 3, ... DN 12 15 20 25 4,Thickness:0.2--0.3mm ss corrugated gas hose high pressure pipe1) Connects ... firmly,2) Has long performance life,3) High flexibility4) Can be bent ... 250-500mm 350-700mm,500-1000mm 750-1500mm 1000-2000mm KH-311 gas connection hoses