#$%^&*AU2011244841B220140508.pdf#####1 ABSTRACT A spray nozzle assembly including at least one wear part (70,150) made from a hard and abrasion resistant material and a protective housing (110) made from a strong and resilient material and having a downstream chamber (118) adapted to receive one or more of the 5 wear parts (70,150) in releasably trapped relationship, the downstream chamber (118) having a wall (134) including a post (137) defined by a slot (138) in the downstream chamber wall (134) either side of the post (137), the post (137) including an inwardly extending protuberance 145 at or near its end and adapted to prevent the wear part (70,150) from escaping from the downstream chamber (118)
