We offer a range of compressed air exhaust mufflers for use with desiccant air dryers, with sizes from 1/2 to 6 inch NPT. Exhaust mufflers reduce the noise of tower depressurization and retain desiccant dust. Our exhaust mufflers are interchangeable with many OEM brands, including Allied Witan (Alwitco), Ingersoll Rand, Sullair, Hankison, ZEKS and many more. We hold stock for many sizes at our location in Boulder, Colorado. And lead times for back ordered mufflers are typically 10-12 business days or less.