I use a 10 gallon round cooler for a MLT and I batch sparge. I don't want to disturb the grain bed during the recirculation (vorlauf) so I made the following:
I took a 5 gallon HDPE bucket (I used a white translucent "Mix and Measure" bucket from Lowe's, which according to the manufacturer's web site - Encore Plastics - is made from virgin materials with no recycled content). I cut off the bottom three inches of the bucket to make a short "bucket". Then I drilled a bunch (80 or 90 ?) of 1/8 inch holes in the bottom. To support the bucket at the top of my cooler I drilled three large holes about 3/4 inch below the top rim of my short bucket, spaced 120º apart, and mounted three large bolts (3/8 inch because that's what I had on hand) 3 inches long, sticking out from the rim. I used a flat washer on the inside and outside of the plastic and a lock washer and nuts to keep tight. From the outside of the bucket to the inside I have the bolt head, a flat washer (free floating), a nut, a split washer, a flat washer, the bucket rim, a flat washer, and another nut, with just enough bolt sticking into the inside of the bucket to hold the last two items. The items listed after the free floating washer are to secure the bolt to the plastic bucket. The free floating flat washer between the bolt head and the "bucket" is to catch on the outside of the cooler rim and keep the bucket from sliding too far in one direction and falling into the cooler.
So all I have to do is open the cooler and lay this device right on top (with the free floating washers pulled out next to the bolt heads on the outside of the cooler, and begin recirculating. I can just dump the liquid into the bucket bottom as fast as I can pour and don't have to reach down inside the cooler and try to pour gently. It only took me a few minutes to make this - the only disadvantage I see is cost - in my case I only had to buy the bucket - I had all the other hardware in my spare parts bin. The hardware doesn't even have to be stainless since it doesn't contact the wort.