Black PVC in town

[muck]

The dark Grey PVC is Schedule 80 where as the white PVC is Schedule 40. The difference is the pipe wall thickness. The Sch80 is a little thicker and can handle slightly higher pressure.

You should be able to get Sch80 PVC at any major plumbing supplier like Emco or the like. Take a look in the Yellow Pages and see what major companies are in your area.