Abstract: An assembly is described for securing a flow conditioning device such as a water meter between fittings of a fluid conduit along with another conditioning device such as a backflow preventer. The assembly includes a manifold including two fluid passageways pivotably connected to return bends that facilitate mounting of the meter along an axis parallel to the axis of the conduit. Fittings along the manifold enable one end of the manifold to be mounted to the conduit while the remaining end mounts the backflow preventer. The manifold ends are spaced such that the one manifold end and the remote end of the mounted backflow preventer are spaced by a distance substantially equal to the distance between mounting fittings on the meter. Additional provision is supplied for mounting of an accessory such as a pressure relief valve on the manifold.