def L_diffuser_outer(sed_inputs=sed_dict):
    """Return the outer length of each diffuser in the sedimentation tank.
    Parameters
    ----------
    sed_inputs : dict
        A dictionary of all of the constant inputs needed for sedimentation tank
        calculations can be found in sed.yaml
    Returns
    -------
    float
        Outer length of each diffuser in the sedimentation tank
    Examples
    --------
    >>> from aide_design.play import*
    >>>
    """
    return ((sed_inputs['manifold']['diffuser']['A'] /
           (2 * sed_inputs['manifold']['diffuser']['thickness_wall']))
           - w_diffuser_inner(sed_inputs).to(u.inch)).to(u.m).magnitude