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1 t wt. = 219.97 gal Imp.
1 gal Imp. = 0.0045 t wt.
Definition of metric tonnes of water provided by WikiPedia
The water ton is used chiefly in Great Britain, in statistics dealing with petroleum products, and is defined as 224 imperial gallons (35.96 cu ft; 1.018 m3), the volume occupied by 1 long ton (2,240 lb; 1,016 kg) of water under the conditions that define the imperial gallon.
Definition of U.K. gallon of water provided by TheFreeDictionary
A unit of volume in the British Imperial System, used in liquid and dry measure, equal to 4 quarts (4.546 liters).