For vertical terminations only. Aluminum inner wall, galvanized outer wall. For approved gas appliance. Provides improved performance in high wind conditions. SKU: 40675666 MFG: 3GVVTHR Shop more products by M&G DuraVent. SHARE Share on Facebook Tweet on Twitter Share on Google+ Pin on Pinterest Free shipping over $35 Sold out $16.56 Quantity Sold Out Sold out Request a Bulk Quote Thank you for your quote request. We will be in touch. DETAILS Description DESCRIPTION Highlights: Size: 3" For approved gas appliance OD is 5/8" larger than ID Aluminum inner wall, galvanized outer wall Provides improved performance in high wind conditions For vertical terminations only Boxed FEATURES MFR: 3GVVTHR SKU: 40675666 UPC: 662492000144 Brand: M&G DuraVent