The spray nozzle is designed and manufactured in accordance with IEC60529 clause IPX3 and IPX4. It is used for the waterproof test of the electric appliance. Some parts of the enclosure can not be wet by the oscillating tube. Under this circumstance, the handheld spray nozzle is used by manual.
The difference between IPX3 and IPX4 is that the baffle should be removed in the IPX4 test.