Legendary Kicker sound and power translates to the water, forests and mountains as well. Durable equipment designed specifically for your boat, motorcycle, off-road vehicle or utility vehicle makes your work or fun much more enjoyable. From the lakes and harbors to the rocky cliffs and desert sands, Kicker strives to keep you Livin' Loud in the elements.Kicker Marine Mounting Adapter Extender KMTAP For pipe diameter sizes 1-5/8", 1-3/4", 1-7/8", 2" (Pair)