Manufacturer: Wix. Style: Spin-On Hydraulic Filter. Service: Hydraulic. Type: Full Flow. 
Media: Enhanced Cellulose. Height: 5.209. Outer Diameter Top: 3.663. Outer Diameter Bottom: Closed. Thread Size: 1-12. By-Pass Valve Setting-PSI: None. 
Beta Ratio: 2/20=6/20. Burst Pressure-PSI: 350. Max Flow Rate: 12-16 gpm. Nominal Micron Rating: 21. 
Gasket Diameters: Attached - O.D. 2.729/ I.D. 2.415/ Thk. 0.255. 
Principle Application: Universal Hydraulic Applications - (20 Micron) - for 10 Micron version, use 51551, for 33 Micron, use 51553.