Braun OEM BR64184624 Screw Ring with Seal Complete for MX2000 OEM.  

People Also Ask:   Does the seal go on top?

Yes, the seal installed on the jar, next comes the cutter assy then the jar nut.

Comes with collar and seal.  Efficiently seal your jar with the Braun Jar Nut Seal. This adapter fits Models 4184-MX2050, 4184-MX2000, and 4184-MX2050 from the Multiquick series. Keep your blender cutter running smoothly with this high-quality gasket and ring.