FasNSeal Collection Storm Collar for 4 Inch FasNSeal Vent Pipe Warranty Notice: M&G DuraVent warranty applies to this professional grade product only when installed by a trained professional installer. This FasNSeal Storm Collar for 4 Inch FasNSeal Vent Pipe features a patented built in mechanical locking band and triple lipped directional gaskets which allows for ease of installation. Use to create a weather tight seal between the pipe and flashing. Features: Inner Diameter: 4 Fuel Types Compatible With: Gas UL Listed: Yes Limited Lifetime Warranty All FasNSeal single-wall and double-wall vent lengths and components feature patented built-in mechanical locking band and triple lipped directional gaskets. All pipes and components are engineered with smooth clean welds located 90° from mechanical locking bands. This construction feature allows for ease of installation. All FasNSeal components which come in contact with exhaust gases and condensates are now silicone free. This important design and manufacturing feature greatly reduces the chances of system breakdown and failure. The main problems with silicone are there are too many adhesion factors which are very difficult to control and the process of binding similar materials with an epoxy, which can weaken the bond over time. Welded seams ensures a leak-free product that is meant to last. Looking for Simpson Dura-Vent? You found it! Simpson Dura-Vent has changed their name to DuraVent. DuraVent is a recognized technological leader in the venting industry. Consistently the first to market with new innovations in venting systems, DuraVent has captured a leadership position in emerging markets. DuraVent has patents for several products and continues to design safe and technologically advanced venting. The company's research into solving problems with corrosion, when biofuels such as corn are used, led to the break-through patent for PelletVent Pro. Scientifically proven materials and unequalled engineering make DuraVent products not only the best choice, or safest choice, but the only choice for professional quality venting products.