Paul WNC I think you'll find that that is hog hair,at least that's what they called it 60 yrs. ago. Could get it out of an old rusted out air cleaner or oil fill cap.Somewhere I saw a paper filter like a lawnmower on that. It's good to protect your booster,mine likes a drink of hydraulic jack oil-specially right before cold weather. They then make a special noise when they're happy !!