This is a must part for all Bus reservoirs to connect between
the brake fluid resvoir and the hose that connects between the
upper line to the lower reservoir that sits on top of the master
cylinder below. Requires 2 per car one on each end of the
hose to seal and stop the leak of any break fluid, this is
a must part for all Buses without this you will have leak
in your system. Fits Bus 1968-1979 get a pair today.