Kaeser's Modular Membrane Dryer, No. KMM, is a low-mainetnance way to produce dew points from 40 degrees F to -40 degrees F. The dryers feature a bundle of tube-shaped membranes that allow only water vapor to pass. At the discharge end, a small amount of dry compressed air sweeps the water vapor out of the dryer. Modular connections mate the KMM with prefilters and afterfilters for easy installation. Optional purge saver prevents the loss of compressed air and extends the life of membrane bundle.