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A dual flush toilet; note the two buttons at the top of the cistern. A dual flush toilet is a variation of the flush toilet that uses two buttons or a handle mechanism to flush different amounts of water. The purpose of this mechanism is to reduce the volume of water used to flush different types of waste.
Usually the quantity of water is marked on the cistern and depending on the performance of the bowl a dual flush can be achieved e.g. 3 ⁄ 6 L (0.13 US gal), 3 ⁄ 4.5 L (0.18 US gal), 3 ⁄ 3 L (0.26 US gal), 1 ⁄ 2 L (0.13 US gal), etc. A normal or delayed action refill valve is used.
[27] [23] All of the fuel was carried in the wings, with a 212.5 US gal (804 L; 176.9 imp gal) tank mounted between the inboard nacelle and the fuselage, and a 425 US gal (1,610 L; 354 imp gal) main fuel tank as well as a 212.5 US gal (804 L; 176.9 imp gal) fuel tank located between the inner and outer nacelles, on both sides of the aircraft ...