The DirectVent Pro 4 x 6-5 8 Inner Diameter Galvanized Wall Thimble - Reduced is a component that is used in a typical venting installation. The DirectVent Pro small wall thimble provides a complete wall-pass-through and fire stop. Use with Round Horizontal Cap and Sconce Cap only. May be required in Canada. Refer to the appliance manufacturerÂ’s installation instructions for requirements.ADA Compliant: No Depth: 4 Fuel Type: Natural Gas, Liquid Propane Height: 11 Material: Galvanized Steel Pipe Class: Direct Vent Pipe Inside Diameter: 4 x 6-5 8 Pipe Shape: Round Style: Contemporary Modern UL Listed: Yes Vent Construction: Double Wall Weight: 20 Width: 11