What are some brands that you use, and like for a parlor?
We use interpuls. Works fine, however if you feed grain in parlor you will need to take pulsators apart and clean more often due to the grain dust.
They do slow down in cold winter temperatures.
We have used interpulse, BRK and OHTA.Of the three, like the OHTA pulsator the best.We feed in the parlor,lots of dust and as FF says you need to keep them clean.
The OHTA pulsator doesn't slow down like the other two,even in our unheated parlor.All three have all kinds of adaptors as well as repair kits.
May not matter to you but the BRK model is a lot louder than the others.