The 3SPX30G1I from CAT Pumps was used in many pressure washers. Unfortunately, it is no longer manufactured, but you can still repair it; parts are still available. This pump physically resembles a number of other pumps with similar names, so make sure before starting any repair jobs that you are looking at the information for your specific pump.
This pump has a max PSI of 3000 and a flow rate of 3.0 GPM.
Click here for a Parts Breakdown Diagram
Click here for a step by step valve repair guide
Click here for a step by step seals repair guide