Pipa pelliculae quadrata Galvanizata est pipa pelliculae quadrata quadrata cum forma intersectione quadrata et granditudine qua formatur a fermento frigido et frequentia alta fermento per calore torculata aut frigido torculata calvanizata aut calvanizata coila quasi vacua.Or a galvanized rectangular tube made of cold-formed hollow steel pipe prepared in advance and then processed by hot-dip galvanizing.