Quote Originally Posted by PoolDoc View Post
PoolJunkie's idea is workable, though I've not seen that done in my area.

The method used here is to plug the lower opening WHILE the blower is forcing air through the pipe. Of course, with your particular set up that means someone has to get wet and cold.

. . . membership updated.
I use to do the "cold & wet" method (of course I was the one getting cold and wet..lol) until I bought these;

http://www.amazon.com/gp/product/B00...?ie=UTF8&psc=1

http://www.amazon.com/gp/product/B00...?ie=UTF8&psc=1

They seem to work fine, although I have no way of confirming absolutely that they don't leak over the winter.

I must admit I questioned the need to blow out the bellow ground pipes in our area (SE coastal VA) since it rarely stays below freezing. I have a hard time believing the ground freezes that deep here. However, the installer warned that a cracked pipe or skimmer would cost big bucks to repair, so I blow out the lines to be on the safe side.

Edit: Found some more one way valves;

http://www.amazon.com/One-Way-Swimmi...2XYRJBCAMNB3Z8