Nearly one-third of all registered users on www.charlottepipe.com won prizes in a recent promotion to announce the newly redesigned Web site. Plumbing contractors, distributors and engineers earned a chance to win power tools, a mousepad, or a Charlotte Pipe and Foundry hat, just for completing an online or mailed-in registration form. The top prizes of the promotion were new Porter-Cable Tiger Claw reciprocating saws and Porter-Cable cordless drills, which were awarded to 32 lucky registrants.