BUT...from reading and various pictures, I've come to find out dome percolators and simple splash catchers are sometimes confused. Is there a simple way to identify between the two? What I have is a hose that resembles a straw coming from the beaker base into a small dome, that has holes/slits along the base of the dome I hope I'm being clear.
Of course, there are undoubtedly several percolator bong users around questioning precisely just what this particular term percolator implies, and whether it really helps. A percolators is an apparatus for your bong or water pipe which assists to cool off smoke.
Water pipe percolators, according to wikipedia, are an "additional sub chamber within the shaft of a water pipe that provides in-line smoke interaction via heat exchange and If you're looking into a waterpipe that goes beyond the simple straight-tube or beaker style, you are probably looking at water pipe percolators.
The percolator is usually in a dome shape but lately have been found in all kinds of crazy designs. It is basically an additional water chamber for your bong and usually lives in the tube of the bong. It contains water in it and is another filtering process for your smoke.