  This paper is concerned with the existence of transition fronts for a
one-dimensional twopatch model with KPP reaction terms. Density and flux
conditions are imposed at the interface between the two patches. We first
construct a pair of suitable super-and subsolutions by making full use of
information of the leading edges of two KPP fronts and gluing them through the
interface conditions. Then, an entire solution obtained thanks to a limiting
argument is shown to be a transition front moving from one patch to the other
one. This propagating solution admits asymptotic past and future speeds, and it
connects two different fronts, each associated with one of the two patches. The
paper thus provides the first example of a transition front for a KPP-type
two-patch model with interface conditions.
