Selkirk 4 in. Pipe Diameter Adjustable Wall Thimble

This 4 in. Adjustable Gas Vent Type B Wall Thimble boasts a long list of convenience features. That including a durable galvanized-steel outer pipe, die-formed ends and convenient lock tabs. This wall thimble is designed for use on approved gas appliances in residential, light-commercial and industrial applications.

• Wall pass-through maintains airspace clearance
• Adjusts from 4-1/8 in. to 7 in. to fit thickness of wall
• Wall thimble serves as a firestop