Abstract: There are provided firstly a fuel cap which irrespective of its type has a structure that there is no transpiration of gasoline vapor until the cap is fully open and secondly particularly a bayonet-type fuel cap which has a structure that there is no eruption of fuel under a pressure difference between a internal pressure of the tank and atmospheric pressure. In each case the fuel cap consists of a closure 3 fitting into the opening of a filler neck 4 and a handle 2 integral with the closure 3, and an upper seal ring 10 and a lower seal ring 1 for sealing the filler neck 4 are each fitted individually to the closure 3 positionally apart from the other.

Abstract: There are provided firstly a fuel cap which irrespective of its type has a structure that there is no transpiration of gasoline vapor until the cap is fully open and secondly particularly a bayonet-type fuel cap which has a structure that there is no eruption of fuel under a pressure difference between a internal pressure of the tank and atmospheric pressure. In each case the fuel cap consists of a closure 3 fitting into the opening of a filler neck 4 and a handle 2 integral with the closure 3, and an upper seal ring 10 and a lower seal ring 1 for sealing the filler neck 4 are each fitted individually to the closure 3 positionally apart from the other.

Abstract: An oil level gauge having a simple structure so as to be readily assembled, an accidental disconnection of a handle from a rod being prevented, favorable contact between a rubber packing and an inner wall of a gauge insertion pipe being assured, and a reliable water-proof arrangement being obtained to prevent water from entering into an oil tank. The oil level gauge includes a rod including an oil level indicator at its lower end, a handle provided at an upper portion of the rod, and a rubber packing fitted on the rod in the vicinity of the handle; and these components are tightly assembled each other via a pressing force provided by the rubber packing which is being compressed.