Abstract: A fluid sprayer apparatus attachable to an aircraft comprising a center section nozzle tube, a pair of detachable extension nozzle tubes connected to said center nozzle tube by quick disconnect fixtures, a manifold tube for supplying spray fluid to said nozzle tubes, said spray nozzle tubes having a plurality of inlet fittings spaced along their lengths and a plurality of pressure operated spray nozzles each removably attached to one of said fittings, said nozzles comprising a body member, a plunger slidably received in said body member with a pressure piston extending into said fitting, said plunger carrying a seal member engagable with the outlet end of said fitting to close said nozzle to fluid flow and a control insert unyieldably holding said seal member in sealing engagement with said inlet fitting when in a first position and yieldably holding said seal member in sealing engagement with said inlet fitting when in a second position whereby said nozzle may be opened to fluid flow by fluid pressure agains