separate ways rotating joint for air and hydraulic oil
at high pressure. The rotor is made of cemented steel
and lapped for reducing friction. The seals are made of
PTFE. The external body is machined from aluminium bar
to avoid any porosity, while the alignment of unit is
given by ball bearing and self lubricant bushing of
pressed bronzeo There is a threaded hole in the external body to avoid flow
from first to second way.