We replaced the existing assembly because parts had deteriorated and rusted thru several years of service. New part works extremely well and feels like a brand new faucet. The replacement was easy to do, too.
My faucet quit working and I found an old Venturi Assembly in my garage. I installed it and it worked for a few days. I ordered a brand new 2000 Dishmaster and when it came, of course it was beautiful!, But, before installing it, I took a chance and ordered a new Venturi Assembly and it arrived in a couple of days. Fantastic, my old Dishmaster works very well and I have a new unit to put in when the old one requires more (really?) repairs!
Much easier than trying to replace the parts individually. Also sure to work right.