When operating under high gas loads, rotary vane pumps exhaust small drops of oil with the exhaust gases. This 'oil carryover' will eventually deplete the oil level in the pump reservoir until the oil level will fall below the amount required to operate the pump without damage. The Agilent exhaust filter uses a coalescing filter element to recapture oil from the exhausted gases.

The oil return kit is added to the exhaust filter to provide for oil collected in the exhaust filter to be returned automatically to the pump reservoir.

The optional oil drain extension is available to extend the oil drain plug 40 mm out from its position in the pump case, allowing easier access for oil to be drained into a waste receptacle.