1)Material quality: S304 or 316L 2)Standard: ISO, DIN, SMS manhole cover(circular manhole cover,tank cover) manhole cover(circular manhole cover,tank cover)1)Specification: as request2)Material quality: SS304 or 316L 3)Standard: ISO, DIN, SMS 4)Application: beer,food,pharmacy,berverage,cosmetics,and chemical industry manhole cover