Pratissoli HS Serie Manuel D'utilisation Et D'entretien page 23

In any case the oil must be changed at least once
a year, as it is degraded by oxidation.
For a room temperature other than between 0 °C - 30 °C,
follow the instructions in the following diagram, considering
that oil must have a minimum viscosity of 180 cSt.
Viscosity / Room Temperature diagram
mm /s = cSt
2
The used oil must be poured unto a suitable container and consigned to an authorised recycling centre.
Do not release used oil into the environment under any circumstances.
8 PORTS AND CONNECTIONS
The HS series pumps (see Fig. 4) are equipped with:
 No. 2 "IN" inlet ports 1" Gas.
Line connection to any of the two ports is indifferent for
proper pump functioning. The unused ports must be
hermetically closed.
 No. 2 "OUT" outlet ports 3/4" Gas.
Ambient temp. (°C)
23
Fig. 4