Nominal diameter

Source: https://baymeters.com/products/option-set-1639250-dropdown-5

VariantPriceAvailability
DN200(8 in)883.00 USDIn Stock
DN300(12 in)1949.00 USDIn Stock
DN500(20 in)3603.00 USDIn Stock
DN800(32 in)19191.00 USDIn Stock