GLM Pump Base Kit. Water pump base kit for Sea Water pump. Made with quality materials to withstand the harsh marine environments. Features of GLM 12320 Pump Base Kit Replacement pump base kit For use with Mercruiser For 1984-1990 models Made with quality materials Refer to manufacturer recommendations for proper fit/installation information Package Contents: GLM 12320 Pump Base Kit GLM 12320: Pump Base Kit