4 holes connector close-up is following.

Illustration of usage

Please notice the Figure below to learn the function of holes.

Dry the plug of the polisher before connecting.

And dry the socket on the hose.

Tighten the connector firmly, to prevent water from flowing into the air path. otherwise,The water will cause powder agglomerated.

Powder outlet is small. Particles bigger than 100 mesh will be block.??

The particle size must be fine than 100 Mesh.

O-rings here is used to isolate water and powder flow. The O-rings must be undamaged.