Air filter foam pre-cleaner for Vanguard powered 3000/4000 series tractors. Genuine Briggs & Stratton, p/n 272490 replaces Ingersoll C37543. See p/n 394018S for the matching air filter element. Order p/n 805267 if you have the early design square pleated filter. Note, filters are shipped unboxed as we purchase them in bulk packs and pass the savings on to you!