Check the listing for details. Cummins Power Generation Generator Parallel Kit - A058U945 New. Condition: New. Listed at 59.95 USD. The Cummins Onan P2500i Paralleling Kit allows two inverter generators to run in parallel and provide up to twice the power of a single generator. The A058U945 works with two P2500i generators. The Cummins Onan P2500i Paralleling Kit doubles the power available by combining the power of two generators with one cable.