I didn’t check the durometer of the mudflap which came off a semi. It worked quite well, as it had canvas integrated into the material. Not too long ago I had quite a few NOS impellors and gave several away. The second box, which I kept, I found out were used ones. Until I find a piece of used rubber that will work, I’ll just take a new one out of one my unfinished projects. Got half way done with a junker a couple of years ago and have been finding much better motors ever since. Still have a good supply of other eccentric impellors. Just wanted to know if the 2.5 Johnson would pump enough to cool a 3hp Gale product. It might not hurt to buy some rubber stock for next time. Thanks