A degerminator having a base, a plate with a plurality of protrusions, and a clamp that engages the plate to removably secure the plate to the base. A degerminator having first and second plate assemblies and an enclosure that surrounds the first plate assembly. The second plate assembly has a seal that moves between deflated and inflated positions. The second plate assembly moves between a first position, in which it does not engage the enclosure, and a second position, in which the seal engages the enclosure when inflated. A degerminator having a frame, first and second plate assemblies, supports and guides each coupled to the frame or the second plate assembly, and actuators each coupled to the frame and the second plate assembly to move the second plate assembly relative to the first plate assembly. A removable wear ring may protect a side wall of the enclosure.