This is my Bennett 155 "Tidewater" pump. These pump are prone to rust in the tops due to the design. The top is welded together and the cast iron air separator is in the raised center section. Dirt and moisture collect in between and cause rust. There is an early and a later version. The early version has a narrow raised top section and a computing clock unit like Tom`s blue 145 Tidex dislay pump posted above. The later version is like mine with a wider raised top section and a Veeder-Root computer. The Bennett 145 and 155 was available to any oil company.