WARNING: This page is about a different car, the 2020 Buick Regal and 2019 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
Courtesy of GENERAL MOTORS COMPANY
Fluid Transfer Pipe Removal
Callout
Component Name
1
Fluid Transfer Pipe
2
Fluid Transfer Pipe Seal Procedure Remove and DISCARD the seal.