Florentino Kitchen Set F-031-4VAY 4-hole faucet. I'm experienceing an issue with the side sprayer having much less pressure than it did when it was installed about 6 months ago. I disconnected all the hoses and blew air through them, as well as the sprayer vale (in the head)but still no pressure, so I removed the diverter valve (three way) from the bottom of the spout stem. It seems to have some kind of small, hydro-pressure actuated valve in it that is preventing air going through either from the spray hose port or the spout port. Air moves freely between the H&C ports and the Spout port, but not from either into the sprayer port on the bottom. Should I remove this small internal valve? What can I do to get the original performance back?

You're right, of course. I removed the diverter, and compared it to a "universal" spray diverter part from Home Depot and they don't compare. Mine doesn't seem to have any position where water can move freely between the chamber and the hose. The little piston fits very tightly, and the actuator plug is rimmed by a rubber o-ring making a tight seal. Looks like a bad design. Maybe I should remove the o-ring?

You're right, of course. I removed the diverter, and compared it to a "universal" spray diverter part from Home Depot and they don't compare. Mine doesn't seem to have any position where water can move freely between the chamber and the hose. The little piston fits very tightly, and the actuator plug is rimmed by a rubber o-ring making a tight seal. Looks like a bad design. Maybe I should remove the o-ring?