Abstract: A distributor which is mountable on a vehicle and is arranged for distributing a fluid from a reservoir to a number of nozzles through which the fluid is dispensed. The distributor includes housing, a first number of connections extending from the reservoir to the housing, a second number of connections extending from the housing to a nozzle, and a number of multi-orifice plates. The orifices in at least some of the multi-orifice plates have different sizes than the orifices in at least some other plates. The distributor also includes mountings in the housing for detachably fixing one or more multi-orifice plates at a time in the housing, and a distribution chamber inside the housing. The chamber is in communication with both the first number of fluid connections and the orifices of the multi-orifice plate(s) fixed in the housing. Also provided are a third number of fluid connections extending from each orifice in the multi-orifice plate(s) to each second fluid connection.