It’s strictly designed according to IEC60529 figure 5 & GB4208 standard. It’s to verify protection against spraying and splashing water; second characteristic numerals 3 and 4.

u         Pressure gauge: 0~0.25MPa

u         Pressure gauge range: 0~0.4MPa

u         121 holes with Φ0.5mm

u         1 hole at the centre

u         1 inner circles of 12 holes at 30°pitch

u         4 outer circles of 24 holes at 15°pitch

u         Water discharge: 10L/min, ±5%, adjustable

u         Material: Moving shield: Aluminium, Spray nozzle: brass