Recently installed an "American Standard" tub fixture, now the pressure in the tub is gone, any advice?

I went through the checklist, flushed the pipes, etc... It seems to be in the fixture itself, like it cuts down the pressure. When I dismantled it, the pressure seemed normal, When I put it back together the pressure was gone again. Do I have to replace the fixture, or can I replace the valves in the handles? Or is there a way to adjust the valves?


Thanks for your help!|||What do you mean by "pressure is gone"?


Many new valves will not let water flow unless the HOT and COLD water lines have pressure (Safety Issue)|||is the presure only low in the shower?if so take the flow restrictor out of the shower head