Also, the older Numatics...Henrys and such from 1998 and prior had a 100w power take off socket for a powerhead, after 1998, so 99-present, they did away with that 100w power head take off socket and only the specific two models "HenryTurbo" and "HenryHound" had a power head socket but it was for a lesser powerd head and those were 24v sockets and they had an electric hose and specific wands to fit to the power head.
The older Henry's, you could use the specific power head or any power head that would be compatible and 100w or less, since it had a pretty standard power head socket fitting. those you just clipped the power head cord to the tubes and hose.
Hope that helps.