*UPDATE*  Since fixing the oring seat and damaged section of hose from the oring, I have managed to get this thing to work a lot better.  I have found that if you put the coolant tank as high as possible it will pull enough of a vacuum and actually produce a decent mist.  I was able to put my coolant tank above the nozzle head, and it has consistently been working now.  However, if I put the coolant tank as far below the nozzle as the hose will allow, it will not pull a consistent vacuum, and thus the mist will be intermittent at best.

I do some detail carbide and diamond drilling in glazed ceramics and glass, so I was hoping to use this to keep the drills cool, while pulling the coolant back up from the drilling catch basin.  This doesn't really work.

It barely pulls any vacuum to make a mist unless you cut out the damaged section from their poor o-ring setup clamping down too hard on the tube and remachine and reseat everything.  Even then you have to run it at an absurd pressure, over 90PSI for me, to get it to pull anything.  At 90PSI every air fitting joint leaks.  I tested this with pure water, no cutting additives at all.

Fortunately for me, I only wanted it for the air nozzle and not the mist feature, but someone that expects a proper vacuum mist system will be disappointed. Even only wanting it for the air nozzle, it's fairly marginal at best.
*UPDATE*  Since fixing the oring seat and damaged section of hose from the oring, I have managed to get this thing to work a lot better. I have found that if you put the coolant tank as high as possible it will pull enough of a vacuum and actually produce a decent mist. I was able to put my coolant tank above the nozzle head, and it has consistently been working now. However, if I put the coolant tank as far below the nozzle as the hose will allow, it will not pull a consistent vacuum, and thus the mist will be intermittent at best. I do some detail carbide and diamond drilling in glazed ceramics and glass, so I was hoping to use this to keep the drills cool, while pulling the coolant back up from the drilling catch basin. This doesn't really work. It barely pulls any vacuum to make a mist unless you cut out the damaged section from their poor o-ring setup clamping down too hard on the tube and remachine and reseat everything. Even then you have to run it at an absurd pressure, over 90PSI for me, to get it to pull anything. At 90PSI every air fitting joint leaks. I tested this with pure water, no cutting additives at all. Fortunately for me, I only wanted it for the air nozzle and not the mist feature, but someone that expects a proper vacuum mist system will be disappointed. Even only wanting it for the air nozzle, it's fairly marginal at best.