Globe Marine Run-Dry&reg; Model 2000 Impeller for Mercury Marine 18-3087 & Mercruiser Inboard Bravo 1 with Keyway Made With Run-Dry-- Guaranteed to Run-Dry for Up to 15 Minutes 2-9/16" x 2" Deep, 3/4" shaft diameter, Keyway Drive, 8 Blades. Impeller only- does not include gaskets or o-rings. Replaces Mercury Marine 18-3087 impeller. For Mercruiser Inboard Bravo 1 with Keyway Don't get stranded out on the water -- order a spare impeller today. Water applications only. Made in USA