Precaution: URAI-G blowers: Care must be used when
opening the head plate seal vent chamber plugs (43) as
some gas will escape–if it is a pressure system, or the
atmospheric air will leak in-if the system is under vacuum.
There is a possibility of some gas leakage through the
mechanical seals. This leakage on the gear end will escape
through the gear box vent, and on the drive end, through the
grease release fittings. If the gas leakage is undesirable,
each seal chamber must be purged with an inert gas
through one purge gas hole (43) per seal . There are two