[psychofunk]

I am not sure but the pump sticker says (sorry no digi cam)

IWAKI MAGNET PUMP
MODEL MD-20RZG-1

MAX CAPACITY-------------------------13.5/15-------------l/min
MAX HEAD-------------------------------4.6/6.7-----------------m

RATED VOLTAGE-------------------------------------100--------V
RATED POWER CONSUMPTION------------------43/59------W
RATED FREQUENCY--------------------------------50/60-----Hz
INDOOR

SINGLE PHASE INDUCTION MOTOR
CAPACITOR-RUN

POLES---------------2
VOLTAGE----------100----------V
FREQUENCY-----50/60-------Hz
CURRENT------0.54/0.71------A
OUTPUT-------------20---------W

SPEED--------2650/3000----rpm
RATING-----------------------CONT.
CAPACITOR-------3.5----------uF
INSULATIONCLASSE

THERMALLY PROTECTED
DO NOT RUN PUMP DRY
BLAH BLAH BLAH LTD ETC
------------------------------------------------------------

So looking at it then would that (in the case where there are two numbers seperated by a "/" ) mean at 100v / 120v. I still actually want to find one of those " AC variable transformer" that brucoman mentioned so that I could play with undervolting. Any recommendations on a good one of those things to get. You have to pardon my ignorance but when I did a google I got nowhere so I will be basically asking the same question of one of the guys at home depot and I have more confidence in you guys. Thanks.