What is this?

May 30, 2012
12
Hi all

We had a trouble free summer with the pool. :-D
Now it's time for closing.

I live in NJ, and plan to lower the water below the skimmer line, blow the line with a 3 hp air compressor. Today when I was checking the returns, and found this:
photo_zpsd31faa98.jpg


What do I do this this? Do I need to plug them?


Thanks

Peter
 
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