Sierra 18-2519-9 Seal Ring (Priced Per Pkg Of 2)For use on Volvo Penta I/O Engines. For cooling water pipe 120B, B, 131A, 140A, 145A, B, 151A , B, 171AInterchangeable with: Volvo Penta; 831622; Product Features Priced Per Pkg of 2; Special Order est. 10 Days; For use on Volvo Penta I/O Engines; Supersedes 18-2519;