AD 56508939 Fuelock LPG Filter for Nilfisk Advance, American Lincoln. For models equipped with the LPG (Propane) GM 1.6L industrial motor. These models include, but are not limited to, Granterra, Exterra, Condor XL, SR 2000, SR 1900, ER 1300, ER 1600, CR 1500, 7765, and others. Priced Each. Replaces Nilfisk Advance 56508939. Our Part Number AD 56508939