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Delta replacement part #rp19804. I think I maybe on to something, after looking at different faucets at lowes I see that the holes in the manifold, (where the cartridge goes) has smaller holes than on the supply sides. Got home took it back apart and got some lime away down hole for the bathtub faucet, got some up towards the shower. Flushed it out and reinstalled everything, it made and improvement. Will try more tomarrow, hope I dont have to replace the whole faucet, no shut off valves for the bathtub. Plus the whole tub may have to come out to sweat in new fittings. Sorry about the spelling, been along day.
Let me tell you what to do
get a hose adapter that will fit on the lav faucet
take off the shower head,, and put on a hose adapter on the shower arm
conect a washer hose to both ends.. turn the lav on full blast and backflush out the diverter through the tub spout