If your SPX-UQC doesn't fit on your pressure washer, don't worry! It's likely because your pressure washer has a threaded connection, while the SPX-UQC has a barbed connection. To fix this, simply remove the washer with the wire mesh on the side that connects directly to your pressure washer. This will expose the threaded connection, and you can then screw the SPX-UQC on securely.