Isolator Spacer 9.4mm that fits on top of the TFM Isolator Coupler. For UM2 / UM2+ Family. Should upgrade if you are using the older PTFE coupler spring.

Replaces the older PTFE Coupler spring in the UM2 family. This is a perfectly fitted spacer which no longer applies pressure on the PTFE or TFM coupler so that the coupler lasts a longer amount of print hours before needing replacement.