Address: 832 Thorton Drive, Cedar Hill, TX 75104 USA... Phone: (469) 458-7185... Description: OS Plumbing Experts: Family-owned for over 25 years and fully licensed and insured, OS Plumbing Experts offers 24/7 emergency service plus affordable, on-time plumbing solutions for water heaters, gas lines, drains, and more across Cedar Hill and nearby communities.