An assembly for covering an opening formed in a pressurized tank of an agricultural vehicle includes a cover having a first compression surface and a second compression surface. A hinge assembly is included that has a hinge arm rotatably coupled to the tank intermediate its ends. The hinge assembly further includes a hinge link rotatably coupled to the hinge arm at one end and rotatably coupled to the first compression surface at the other. A latch assembly is provided that has a latch arm rotatably coupled to the tank intermediate its ends. The latch assembly further includes a latch link rotatably coupled to the latch arm at one end and releasably engaging the second compression surface at the other. Accordingly, rotating the hinge and latch arms results in a first and second pressure engaging the cover along the first and second compression surfaces to secure the cover to the tank.
