One-Way Winter Pool Valves

The catalog reads:

"One-Way Winter Pool Valve: Eliminates tiresome water draining to make closing your pool a SNAP! Replaces old "eyeball" return fittings in your in-ground pool. Lets you drain water inside the lines, fill with anti-freeze, and keep pool water from re-entering the lines."

Has anyone used anything like these things before? I think if they work, they'd be well worth it.

We thought we had the winter plug screwed in correctly last year while doing the tag team "I'll blow, you screw" method of clearing & plugging the lines. We were wrong. The fitting was screwed on cockeyed, and so water got into the line, froze up and ruined it. $2K in new lines later, I'm looking for a better solution. Here's the link. Anyone have comments?
http://www.waterwarehouse.com/products/sku-4506.html

We've used those for a few years now. They work great, and we've had no problems at all.

Sorry to hear you had so much money in repairs!

Thanks - they sounded almost too good to be true. So, to do it, you screw the fitting on, run the blower until air comes out the valve and you're all done? Brilliant . . .

And Doggie - thanks for the sympathy. The lines were original (23 years old) so I guess we got our money out of them. The wall plug fitting incident was just the coup de grace. Have a good Fall!

After we blow them out, we add antifreeze, then just snap on the black cap and we are done.

You have a good fall too!