C-Thru Locations   C-Thru Industries, Inc. Administrative & Manufacturing Facility 1477 Davril Circle Corona, CA 92880   800-28-PATIO Toll-Free 951-369-8777 Local Phone 951-369-0847 Fax   Office Hours: Monday - Friday 7:30am - 4:30pm Closed Saturdays & Sundays   Showroom available by appointment only