Preheat oven to 350 degrees F.
To prepare pastry, mix flour with salt and sugar. Pour in vegetable oil and milk. Mix well with a fork. Transfer to a deep-dish pie pan and press with fingers to spread over bottom and up sides of pan.
To prepare filling, combine rhubarb with sugar and flour. Spoon into piecrust. Dot with butter.
To prepare topping, mix butter, sugar and flour with a pastry blender or your hands until crumbly. Sprinkle over rhubarb mixture.
Bake 1 hour or until filling is bubbling and topping is browned.
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