54R3G Adapter for M5x1.0P to M7x0.75P

For users of the 54R3, replacing brake fluid for 105, ULTEGRA,
or DURA-ACE systems requires this adapter to connect
the brake lever oil injection port with the M5 oil injection tube
(or the original oil injection cup Shimano® TL-BR003).
Constructed from anodized aluminum, this adapter offers
greater durability compared to the original plastic adapter and
is less susceptible to oxidation and damage.