  We perform a complete study of the electroweak precision observables and
electroweak gauge boson pair production in terms of the SMEFT up to ${\cal
O}(1/\Lambda^4)$ under the assumption of universal, C and P conserving new
physics. We show that the analysis of data from those two sectors allows us to
obtain closed constraints in the relevant parameter space in this scenario. In
particular we find that the Large Hadron Collider data can independently
constrain the Wilson coefficients of the dimension-six and -eight operators
directly contributing to the triple gauge boson vertices. Our results show that
the impact of dimension-eight operators in the study of triple gauge couplings
is small.
