Jabsco flexible impellers offer reliable, efficient and long lasting performance. Neoprene impellers are used for engine cooling and for fresh or salt water transfer duties. Neoprene impellers are suitable only when small amounts of oil or diesel fuel are present. Nitrile impellers are used for bilge pumping and for transfer duties where the water is heavily contaminated. 17255-0003 Nitrile 1-9/16" x 3/4" x n/a