Here's the deal: I just got through replacing a segment of copper pipe under my rear deck that had split over the winter. The line originates under the house where it doesn't freeze and there is a valve under there to shut off the water for the winter. The problem is that the outside outlet really isn't the lowest part of the line and so water collects in the line even when the inside valve is closed. Then when it freezes, the pipe splits outside under the deck.
I was thinking of some sort of tee/valve arrangement that would allow me to blow compressed air in that would force any residual water out of the line. Anybody have any ideas? I'm open to pretty much anything... I'm just tired of crawling under there to repair splits in the line two out of every three years.