D-tek nozzles

[pH(x)]

If your referring to the DDC, it most certainly is NOT submersible. If it still runs at full RPM's, consider yourself very fortunate. I have an AC top that toasted 1 DDC and 50% toasted another one before I found the hole that force fed PC Ice down the screw hole next to the outlet. The first pump is totally torched and is unrepairable, the other might be salvageable but I don't know if I can be bothered.

I will check the RPM monitor and report back. I am surprised -- as I am almost sure that I read the original pump in its design was submersible, but it does stand to reason that once you change the design from that flush molded plastic top to delrin the properties of the pump change quite significantly :o