The plastic threads on the plastic pump head are far too easy to cross thread. Ask me how I know. Not sure it's worth the price of Stainless, just a warning to be very careful.Preaching to choir on that one... lol
I owned my March pump for probably 3+ years before purchasing a Chugger head for it earlier this year because of that same problem. Now I have a March pump w/Chugger head and a Chugger pump. I use the Chugger pump for my RIMS and have the March pump as a spare...