Selkirk 187707 Rv Wall Thimble 7 Inches

Product Description

The Selkirk 187707 RV Wall Thimble is a Type B gas vent fitting designed to maintain safe clearance to combustibles where a vent pipe passes through a wall. HVAC technicians and installers use this fitting on residential and light commercial gas appliance venting systems. It serves a dual purpose: it keeps the required clearance between the vent pipe and surrounding wall materials, and it acts as a firestop to help prevent the spread of fire through wall penetrations. This is a critical safety component in any gas venting installation and is required by most building codes wherever a Type B vent passes through a combustible wall assembly. The 187707 is part of the Selkirk MetalBest RV line, which is a round Type B gas vent system engineered for approved gas appliances in residential and light commercial and industrial settings. The thimble adjusts from 4 and 1 eighth inches to 7 inches, making it compatible with a range of wall thicknesses without the need for custom sizing. The inside diameter of this fitting is 7 inches, which matches the 7-inch RV vent pipe series. Note that the outside diameter of RV pipe and fittings is approximately one half inch larger than the listed inside diameter. The outer shell is constructed from 28-gauge galvanized steel for durability and corrosion resistance. The inner liner is aluminum, which is the standard material used in Type B double-wall gas vent systems. This fitting is compatible with natural gas and propane appliances such as furnaces, boilers, water heaters, and unit heaters that require Type B venting. Proper installation of a wall thimble is essential for code compliance and long-term system safety. This part is cross-referenced as 7RV-WT.

• Maintains required clearance to combustibles at wall penetrations for Type B gas vent systems
• Functions as a firestop to meet building code requirements at wall pass-throughs
• Adjustable depth from 4 and 1 eighth inches to 7 inches to fit varying wall thicknesses

Product Highlights

The Selkirk 187707 RV Wall Thimble provides both clearance protection and firestop performance at Type B gas vent wall penetrations. Its adjustable design fits a wide range of wall thicknesses, simplifying installation on residential and light commercial gas appliance venting projects.

Product Information

Standard Information

• Brand: SELKIRK
• Manufacturer Part Number: 187707

Technical Specifications

• Vent Type: Type B Round Gas Vent
• Inside Diameter: 7 inches
• Adjustable Depth Range: 4 and 1 eighth inches to 7 inches
• Outer Material: 28-gauge galvanized steel
• Inner Liner Material: Aluminum
• Application: Residential and light commercial gas appliance venting
• Compatible Fuel Types: Natural gas, propane
• Series: MetalBest RV
• Cross Reference: 7RV-WT