Abstract: A cover, especially for an oil tank, has a locking device with flexible arm carrying locking elements flexibly slidable against a bayonet curved track ridge of a tank opening or tank neck for closure of the tank. The locking device cover is capable of being rotated to close the tank opening without manual downward pressure. A bayonet curved track ridge has spring pressure of the flexible arms eliminating need for manual pressure. The construction is a single integral member made from a plate of spring steel, or made from plastic, of suitable flexibility. It has a bed plate with prongs formed from the edges of an aperture through the bed plate for gripping a pin carried by the cover to secure the locking device to the cover. The flexible arms extend in curved contour from the bed plate and have outer free ends on which the locking elements are located which slidably engage the bayonet track ridge in the tank opening or neck for limited rotation up to a stop for locking the cover to a tank.

Abstract: At least two radial piston pumps having a common eccentric rotatable within an eccentric chamber of the pump housing supply pressurized fluid to separate fluid circuits. The eccentric chamber is divided into separate fluid delivery compartments to which fluid is conducted from a common suction port by the pumps through passages that dampen the transfer of pressure fluctuations between the fluid circuits.