I had the same issue. I removed the female end at the end of the hose and replaced it with the Ultimate Washer 1871C Pressure Washer ¼-Inch Male Quick Connect from Amazon. It works great. It doesn't make sense why it ships with two female ends on the hose.
As long as the pressure of the high-pressure washer is in the range of 2000-4500Psi, it is ok. When the pressure is over 2000psi, the floor washing effect is the best.