10 gallon per minute hydraulic pump at 1000 rpm. Commonly used with the 250/251series Chelsea PTO’s. When used with the 122% output speed pto this pump will deliver 12.20 gallons per minute. This pump when combined with the251GDHVP-B5XE pto kit on a Chevrolet/GMC K30 chassis will provide the maximumg.p.m. output for the allowed chassis pto/pump area. (2) Rear #16 O-Ring Ports 5/8″ – 9 Spline Input Shaft 2 Bolt SAE “A” Mounting Flange