We always need parts at the dyno shop so I don't mind grabbing some stuff that is on sale. We are constantly using up exhaust gaskets and spark plugs and it is nice to have an electric water pump for every engine so we don't need to mess around with belts. It is hard to afford a bunch of electric pumps at $300 each but when they are only $30 it isn't so bad. Of course, we'll find out if they are any good. It is a super cheap Chinese pump so it might not last long.