I had the older style Delta single handle kitchen faucet with a ball and seats. I bought a new Delta 400 DST to replace it. I hate the new faucet!!!!!!!!! Do to the rounded base it dose not mount solid it rocks easy. It has very little water flow compared to my old Delta. I would put the old faucet back but my dad cracked the spout trying to hook up the dishwasher ( he did not know how ). Now I and stuck with this garbage faucet with little flow and it drips all the time.