Shimano GRX with J-kit | Mountain Bike Reviews Forum
Shimano Tiagra Hydraulic Disc Brake Caliper BR-4770 - SoCal Bike - Oceanside, Carlsbad and north San Diego county's favorite bike shop, Bicycle and ebike rentals, sales, and service
Convenient Replacement Bike Hydraulic Brake Hose SMBH59BH90 Olive and Connector Insert Set 2 5m Quick and Easy - AliExpress
These are installed on my road bike hydraulic hoses. Are they just a union? Both front and rear have them and they are pictured on the manufacturer website. I think they are kinda ugly but not sure if they have a purpose or what it might look like if I take apart ...