New Stainless Steel DuraVent FSAVL10 FasNSeal 10 Inch Diameter Adjustable Vent Length 300257. 4 available. Retail is $142.61. Find online for $115.98. I will sell one for $75 or all 4 for $250.I have other DuraVent commercial vent pipes and cls listed. I would entertain offers on everything as one package. I will deliver for free to anyplace in the metro or within 50 miles of Elko New Market.