This ceramic ring is the second insulator from the top in the upper section of the nozzle body of Non Contact Cutting Head on a Mark II or NTX. It is located under the Brass Base (M111B0). The ceramic version breaks easier then the teflon version, but it withstands heat better than teflon.
Mazak® Part # 46683302091 / 46683301090-C
Disclaimer
All products are fully compatible with referenced brands, but are not affiliated with, authorized, endorsed, or sponsored by any Original Equipment Manufacturer (OEM) or named brands, unless explicitly stated in the product description.