A polyurethane spray nozzle for high pressure abrasive aqueous slurries of limestone and the like. The nozzle is comprised of a hollow body of urethane having a restricted inlet and outlet with internal vanes adjacent the inlet to provide a swirling motion to the slurry. The polyurethane construction is characterized by a high degree of abrasion resistance with a slick surface to inhibit solids build up and a degree of flexibility to inhibit clogging of the vanes by solid pieces of limestone. In a modification the body may be made in a first piece while the vanes may be inserted therein in a second integral piece held together by a ring. An outwardly extending flange which may be reinforced with a metallic member is provided for connection to a pipe line source for the slurry. The flange portion connected to the pipe line source may be constructed of a softer polyurethane than the remainder of the spray nozzle to enhance the flange sealing connection.