  All statistical models of turbulence take into account Kolmogorov's exact
result known as the "4/5 law" which stems from energy conservation. This law
states that the energy flux expressed as a spatial derivative of the 3rd order
velocity correlator equals the rate of energy dissipation. We have found an
additional exact result which stems from the conservation of helicity in
turbulence without inversion symmetry. It equates the flux of helicity
expressed as a second spatial derivative of the 3rd order velocity correlator
with the rate of helicity dissipation. This exact result must be incorporated
to all statistical theories of turbulence with helicity. After submitting this
paper for publication we learned that the main result was independently found
by Otto Chkhetiani in JETP Lett . 63, 808 (1996).
