Bought new Moen to replace a failing 17-yr-old P-F faucet that I had bought specifically because the sprayer head could be installed either right- or left-sided. Wasn't sure if I could do the same with new Moen so, prior to installation, I disassembled the new one to see if I could reverse the center assembly. No luck. This faucet is specifically designed to only install with sprayer on the R, but not enough of a reason to return. Old faucet took over an hr. to remove due to rusted solid locking plate, while new Moen faucet installed in 15 min., though I did need a helper to hold the assembly in its proper place from above while tightening from below.