... spray nozzle material :PPS detailed spec:2011HSJ-SSseries spiral full cone nozzle can spray small doplet by collision with leptospira, ... least clog,a compact construction against block,these kind of full cone spray nozzle are divide into two types: 2011HSJ-SS ... choose from ceramic, silicon carbide ,F4 and special material 2011HSJ series spiral full cone nozzle