The Italian water pump I put in had no box or identification on the packaging bag. But I can tell you it had a cast iron closed impeller.

''Since, after your tear down of an older HEPU pump, you discovered failing seals, yet quality bearings, Rolandp?''

Good bearings ? I can tell you it was good bearings. After pushing in the center of brass impeller with a fat hammer and a large size punch the shaft assembly would not move. I had to use a cutting disk on 2 sides of the aluminum body to weaken it.

Yet after this hard blow the shaft would still turn smoothly with no perceivable sign of damage or rough spots. REAL good bearings.

''Though when mixing antifreeze to make engine coolant, we use distilled water (or demineralized)''

I am retired as a lab technician and since I use dehumidifier condensate as distilled water. No minerals in there, only dust particles and bacteria.

About the Volvo stamped SS impeller, I just saw the picture after I had answered the previous post. The stamped SS impeller pump I had to remove was not at all that shape. The Volvo impeller is a flat disk with slots while the one I removed had 7 wings impeller and open as a star. I can't see the brand name on the body. I feel the Volvo pump although stamped impeller, is way better than what I had. It has way less open area on the flat surface. I feel it might perform quite well.

Keep on analyzing Volvo stuff, it is quite captivating.