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will be Thanks for ur mail, we generally buy 10, 20, 30 tubes of 58x1800 mm vacuum tube . outer dia of tank 470 mm inner tank thickness 0.40mm . u r welcome to send ur product details and price for further action. we buy since 3 years from china. regads just China supply be acceptHunter soalr water heater, water heater, solar thamerl Solar panels,solar system,solar backpack,solar fans,solar light,wind power sysytem office funiture