Top positive review
Flow restrictor out, flow control is required.
on September 21, 2017
This does exactly what it says it does, it permits you to limit the flow to your showerhead. What's irritating is that we need this sort of thing at all. Not sure how the modern shower pressure balance valve was designed to allow control of temperature but not flow. That's not an improvement to me. My older shower valve you could control both flow and temperature. Regardless, this fixes the problem of making the shower head the flow control. I took the restrictor out of my showerhead and WOW it was just too much. I was getting blown over by the flow and wasting tons of water. The all or nothing approach is rather dumb in my book. This valve solved that problem.
As some have asked, it does indeed reduce the flow even in the wide open position. There are four constrictor vanes that close when you wind it shut so it is to be expected that you would lose a little flow. However, even at full open, it's too much for me so I don't see this as any problem. Also note, that because of the restriction, it does make noise. This also, does not come as a surprise.
All in all, a good piece, it's all brass except for the internals; what did you expect for eight bucks?