After reading the Q&A, several people (including Delta) said that this pump fits the RP50781 dispenser (I installed mine in April 2019 and it came with shipped with my 19790Z-SPSD-DST faucet, which is only sold at Home Depot). The faucet parts and accessories diagram also shows this as the correct part. It does not fit. The inside diameter of the pump bore is too small for the pump head. I made it work by drilling out the pump just enough for me to push the head in.
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