Description: the head of a pump at the point of best efficiency; Name: head at optimum efficiency
Description: Total head developed by the pump at a rate of flow corresponding to the best efficiency; Name: Optimum head
Description: Nomenclature of goods in accordance with a regulation relating to customs tariff and statistical purposes for application to a specific country and / or region. The structure of the customs tariff number is defined by the type otherwise indicated; Name: Customs tariff number