AC Infinity Noise Reduction Clamp 6-Inch, Duct Coupler with Stainless Steel Clamps, Flexible Rubber Coupling for Inline Fans and Carbon Filters in Growing and HVAC

AC Infinity's Heavy-Duty Rubber Couplers work wonders to dampen sound, and provide a clean look to your AC Infinity inline fan and carbon filter. The couplers are made of solid rubber, and come with two clamps for easy installation. They are just thick enough to be sturdy and flexible at the same time. The manufacturer claims a "perfect fit," but a few users point out that it may not work well if used with different brands or if you're attempting to connect an AC Infinity product and a non-standard carbon filter. However, for the price, it is worth the buy since you can find the same item without the branding at a local home improvement store.