Can I use the SPX-UB1 attachment with the soap bottle on my SPX Pressure Washer? Yes, you can use the SPX-UB1 attachment with the soap bottle on your SPX Pressure Washer. Related articles How do I connect my Power Scrubbing Broom model SPX-PWB1 to my Sun Joe Pressure Washer? Will my SPX Pressure Washer accessory work with the on-board soap bottle on my unit? Is this accessory compatible with other brands of pressure washers? Which adapter do I need to use my SPX-UB1 accessory with my SPX Series Pressure Washer? Can I use my SPX-RB1 Pressure Washer accessory with the soap dispenser that is built into my SPX Pressure Washer?