9R204251 9R195764-K Nailer Piston Assembly Replace BTFP1664K FMFP71927 fits for New Bostitch This part is compatible with the following:BTFP1664K Type 0, FMFP71927 Type 0, FN250SB Type 0, FN250SB Type 16155000 and Higher, FN250SB Type 16240001 and Higher, FN250SB Type 17019001 and higher, SB-1664FN Type 0, SB-1664FN Type 1, SB-1664FN Type 14148000 and higher, SB-1664FN Type 15335001 and Higher, SB-1664FN Type 16240001 and Higher, SB-1664FN Type 17019001 and higher Easy replacement and maintenance, excellent performance - please trust us for parts replacement of lawn mowers, brush cutters, and chainsaws Please carefully inspect the appearance of the parts and compare them with our part details to ensure complete consistency Quality Assurance: Well-designed, well-crafted. Upgrade your outdoor tools with our replacement parts