Selkirk 187706 Wall Thimble, 6

Highlights:

• Size: 6
• Type B gas vent
• Adjusts from 4-1/8 to 7L
• Used to ensure clearance to combustibles is maintained
• For approved gas appliances
• Wall thimble also serves as a firestop
• Use in single and multi-story buildings in accordance with NFPA 54 & 211