If you're just plumbing that hose/barb/olive into another lever or caliper, go for it.
Warranty replacement of a GRX shifter....now I can't remember if there was an olive already in the assembly the first time I fitted it a year ago.
Edit: It does....
@Bearlegged started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
If you're just plumbing that hose/barb/olive into another lever or caliper, go for it.