O'brien Plumbing is also listed under the following categories: Standard Yellow Pages Heading (SYPH) Categories:

• Leak Detection Services
• Plumbing Contractors
• Plumbing Repair & Service
• Sewer & Drain Cleaning Service & Repair
• Water Heaters

North American Industry Classification System (NAICS) Categories:

• Plumbing, Heating, And Air-Conditioning Contractors > Plumbing Contractors > Plumbing Repair & Service
• Hardware Stores > Plumbing & Heating Supplies Retail > Water Heaters
• Remediation Services > Gas Detection, Asbestos & Lead Contractors > Leak Detection Services
• Septic Tank And Related Services > Septic Cleaning

Standard Industry Classification (SIC) Categories:

• Plumbing, Heating And Air Conditioning > Plumbing Contractors > Plumbing Repair & Service
• Special Trade Contractors, Nec > Gas Detection, Asbestos & Lead Contractors > Leak Detection Services
• Hardware Stores > Hardware Stores, Nec > Water Heaters
• Repair Shops And Related Services, Nec > Cleaning Services > Sewer & Drain Cleaning