Sintex Underground Water Tank- Product Details: Manhole NOS 1 Diameter Range 47.2 - 84.6 Inch Height Range 46.6 - 82.6 Inch Manhole Extentions Range 7.8- 7.9 Inch Total Height 54.5 - 90.5 Inch Manhole Diameter 15.5 Inch Capacity 1000- 6000 Litres