  Let M be a closed oriented 3-manifold with first Betti number one. Its
equivariant linking pairing may be seen as a two-dimensional cohomology class
in an appropriate infinite cyclic covering of the space of ordered pairs of
distinct points of M. We show how to define the equivariant cube Q(K) of this
Blanchfield pairing with respect to a framed knot K that generates
H_1(M)/Torsion. This article is devoted to the study of the invariant Q. We
prove many properties for this invariant including two surgery formulae. Via
surgery, the invariant Q is equivalent to an invariant of null-homologous knots
in rational homology spheres, that coincides with the two-loop part of the
Kricker rational lift of the Kontsevich integral, at least for knots with
trivial Alexander polynomial in integral homology spheres.
