Ron,
1/2" grey pvc conduit should work fine. Here's how I've done it in the past:
Feed a rope through the pipe (I generally use 3/8" sisal rope), Set the pipe out in the sun to warm it then start pulling the rope bending the pipe until the ends nearly touch and tie off or clamp the rope ends together. Take the bent pipe out of the sun to cool. After the pipe cools unclamp the rope and the pipe should retain most of the bend allowing you to join the pipe ends together.
If your weather is no longer hot or you want to speed the process, you can pipe hot air from a hair dryer through the pipe to warm it, then quickly insert the rope and bend as previously described.
The rope helps distribute the bending force more evenly to prevent kinking.
Greg
