AT trany fluid sucktion tool

[d72hemi]

I recall seeing a advertisement for a tool in one of my car mags but I can not find it now.  It is used to suck the trany fluid through the dipstick, so that you do not spill 4+ quarts of fluid when you drop the pan for the filter. l have seen the suction pump at Auto Zone and Checkers, but those large diameter plastic tube (to short to begin with) does not look like it will work. Does anyone know where I can find the tool in question?

Ian