Plumbers & Steamfitters Local Union No 631

Plumbers & Steamfitters Local Union No 631 is also listed under the following categories: Standard Yellow Pages Heading (SYPH) Categories:

• Labor Organizations
• Plumbing Contractors

North American Industry Classification System (NAICS) Categories:

• Plumbing, Heating, And Air-Conditioning Contractors > Plumbing Contractors
• Labor Unions And Similar Labor Organizations

Standard Industry Classification (SIC) Categories:

• Plumbing, Heating And Air Conditioning > Plumbing Contractors
• Labor Unions & Similar Labor Organizations