part number: 904949. Compatible with Porter Cable FN250B Type 1, FN251 Type 1, Nailer Parts. Package Includes: Overhaul Kit, as the picture shows. handy kit makes an overhaul repair of your FN250B FN251 Nailer fast & easy. These parts install quickly to make your nailer work like new again. A brand-new, unused, unopened, undamaged item in its original packaging. Return refund: If you have any questions, you can refund in full without any problems