MedicineFarm
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here is a top fed drip square i made for a 6" rock wool cube. it is designed to hit all four corners of the block. I'm sure this would work well for a drip over dirt as well and the size could be enlarged to hit a bigger footprint. the dimension that says 1 1/4" should be 1 1/2" in length. notice the holes that are drilled are not directly on the bottom of the elbow, this is offset "up hill" a little bit so roots won't grow back up in em. for the rock wool block application the hole dia. is 3/16".