Preheat the oven to 375°F (190°C).
Place one pie crust into a 9-inch pie dish.
In a large bowl, mix drained peaches, sugar, flour, lemon juice, cinnamon, nutmeg, and salt.
Pour the peach filling into the prepared pie crust.
Dot the filling with small pieces of butter.
Cover with the second pie crust and seal the edges.
Cut slits in the top crust to allow steam to escape.
Whisk the beaten egg with water and brush over the top crust.
Place the pie on a baking sheet and bake for 50 minutes until golden brown.
Remove from the oven and cool on a wire rack for at least two hours before serving.