875-14 UNF-2B SAE O-Ring Ports - Staggered Ports. Displacement: 80.6 CM3/R [4.92 in³/r]. Output Shaft: 31.75 [1.250] DIA. Case drain: 7/16-20 UNF-2B O-ring port size 4. Mounting Type: Standard, 2-Bolt Flange - 3.25 in Pilot Dia - SAE A.