Greenhouse Galvanized Steel Pipe Standard: ASTM A53,BS1387,BS4568,EN39 Size: ... :1.2-3.5mm Length:3-8meter (ASTM A53,BS1387)Greenhouse Galvanized Steel PipeDIAMETER:DN15-DN200O.D: 21.3-89mmWall Thickness ... , certifying that the tubes supplied comply with this Standard. (BS1387)Greenhouse Galvanized Steel Pipe