Review on Control Adjustable Pressure Regulator Sprayer by Patrick Jarvis

The male thread was out of specification and would not screw into the shower head. The internal thread that was screwed onto the pipe sleeve was fine. After measuring the thread, the pitch and large diameter were good, but the smaller diameter was too large. So basically the bottom of the V-groove in the threads wasn't cut deep enough, resulting in about a thread interlocking before twisting. I used a smaller diameter file and eventually got the right fit. Work for 5 minutes took an hour and a half. Poor quality control in my opinion.