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So I am replacing a return on my gunite pool. I am drilling a 2 inch hole, for 1.5" pipe. I was contemplating using a 2 part epoxy like RCF. I've googled this extensively, and found almost zero info on this. From the very limited info I found people use hydraulic cement. If I use hydraulic...

There is a hole in the elbow joint it look drilled out but i don't know why it there. I've attached a picture and am wondering if this was done by design or manufacturing error. Jam