Fujitsu PRIMERGY RX2530 M4 Upgrade And Maintenance Manual page 324

Liquid cooling (LC)
Figure 233: LC device completely installed
Ê If applicable, remove the two orange protective caps from the tubes.
I
Keep the protective caps for future use.
Ê If you have replaced the LC device, install the two orange protective caps
onto the quick connectors of the defective LC device, see position 9 in figure
212 on page 308.
324 Upgrade and Maintenance Manual
RX2530 M4