Elbows must be supported when installed. For approved gas appliance. Offsets obstructions as needed. Aluminum inner wall. Elbows swivel 360 degrees at base. Galvanized outer wall. SKU: 40675740 MFG: 4GVL45R 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 $12.19 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: 4" For approved gas appliance OD is 5/8" larger than ID Aluminum inner wall Galvanized outer wall Offsets obstructions as needed Elbows swivel 360 degrees at base 45/60 degree elbow is adjustable from 0 degrees to 60 degrees Elbows must be supported when installed Boxed FEATURES MFR: 4GVL45R SKU: 40675740 UPC: 662492000366 Brand: M&G DuraVent