Thanks very much,
I am not really sure where the info is, but I will try to explain:
You will need a 1 1/4 inch piece of pvc, 1 "t", and one "90", alsp 1 cap for the top of the "t"...
Basically, the t connects to the riser tube, vertically, after you remove the sponge, drill a 3/8 inch hole int the cap and put it one the top of the T, connect the 90 to the horizontal part of the t and then run about a 8 inch piece from the 90 down for water return.....
the riser tube will still work same as before, up and down for water adjustments.........
I know this is a little confusing, but if you look at the pics of my sump, you should be able to see what I am talking about........
PM me if you need further assistance........
John