  If a narrow Theta^+ pentaquark exists, it is likely that a ud\bar s-ud
triquark-diquark configuration is a significant component of its wave function.
If so, the mechanism responsible for the binding of a triquark and a diquark is
also likely to bind the triquark to an \bar s antiquark. We discuss the
expected properties of such a ud\bar s-\bar s tetraquark meson. In particular,
we point out that for a 0^+ isoscalar ud\bar s\bar s meson the lowest allowed
decay mode is a four-body K K pi pi channel with a small phase space and a
distinctive experimental signature.
