The Selkirk 187706 Wall Thimble is a Type B gas vent fitting designed for use with Selkirk 6-inch RV Type B gas vent pipe systems. This wall thimble serves as a critical interface between your gas venting appliance and the wall or roof penetration, ensuring safe and code-compliant installation of gas-fired water heaters, furnaces, stoves, and other venting applications.
Built with double-wall construction featuring an inner aluminum liner and outer galvanized steel shell, this thimble maintains permanent insulation with a built-in air space that keeps the inner pipe hot while keeping the outer surface relatively cool. This dual-material construction also functions as a firestop, ensuring proper clearance to combustibles is maintained and meeting fire safety requirements.
Features and Benefits
- Double-Wall Insulated Design: The built-in air space between the aluminum inner liner and galvanized steel outer shell provides permanent insulation, reducing heat transfer to surrounding materials.
- Firestop Protection: Maintains clearance to combustibles and functions as a firestop to enhance fire safety and meet code requirements.
- LockTab System: Includes an alternative method to secure pipe when required by local building codes.
- Aluminum and Galvanized Steel Materials: Inner liner is aluminum with galvanized steel outer construction for durability.
Specifications
- Brand: Selkirk
- Model: 187706
- Type: Type B Gas Vent Wall Thimble
- Size: 6-inch (Inner Diameter 6-5/8 inches, Outer Diameter 10-3/4 inches)
- Material: Aluminum inner liner with galvanized steel outer shell
- Application: Selkirk 6-inch RV Type B Gas Vent Pipe systems








