Use in single and multi-story buildings in accordance with NFPA 54 & 211. Used to ensure clearance to combustibles is maintained. For approved gas appliances. Wall thimble also serves as a firestop. SKU: 40656475 MFG: 187703 Shop more products by Selkirk. SHARE Share on Facebook Tweet on Twitter Share on Google+ Pin on Pinterest Shipping charges calculated at checkout. Normally ships within 24 hours $18.99 Quantity In Stock Add to cart Request a Bulk Quote Thank you for your quote request. We will be in touch. DETAILS Description DESCRIPTION Highlights: Size: 3" #3RV-WT Type "B" gas vent Adjusts from 4-1/8" to 7"L Used to ensure clearance to combustibles is maintained Wall thimble also serves as a firestop For approved gas appliances Use in single and multi-story buildings in accordance with NFPA 54 & 211 FEATURES MFR: 187703 SKU: 40656475 UPC: 053713130373 Brand: Selkirk