PUMP-5: 24V DC: Reversible hydraulic gear pump. 3.0L (183 cui) / min. For cylinder displacement of 290 - 960 cc (17.7 - 58.5 cu. in.). O-Ring Boss (ORB) connections. Includes 3 x ORB-5 to 9/16 UNF fittings. SteadySteer compatible. (NAC-3 / AC42 required).