'De Vier Noorder Koggen' (Oosterdijk 4) was built in eclectic forms in 1869 to replace fourteen polder mills. The middle section with workshop is flanked by lower components for two separate steam pumping stations that transported the water from the Kleine Vliet to the lock chamber.
In the Oosterdijk there is a sluice from 1893 with three openings for the discharge of the water on the IJsselmeer. Next to the old pumping station in 1907 with rationalistic details and a second pumping station, consisting of a machine house and a lower boiler house with chimney pipe. The pumping station, which was electrified in 1939, was in operation until 1977 and has been a steam engine museum since 1985 (restored in 2004). The inventory includes four centrifugal pumps from W.H. Allenson & amp; Co in Bedford (England) with electric motors from 1940. In the section from 1907 a steam engine from Backer & amp; amp; Rueb (1924) and a centrifugal pump, made by Louis Smulders (1907). In the boiler house there are two boilers from Machinefabriek 'Breda' (1926).
