NPRNTeitlMath O SaflePerthynasNPRN309613TeitlElan Aqueduct: Wye Aqueduct, Wye SyphonMath O Saflen/aPerthynasConsists ofNPRN309615TeitlElan Aqueduct: Outlet, Wye SyphonMath O Saflen/aPerthynasConsists ofNPRN309614TeitlElan Aqueduct: Washout Chamber, Wye SyphonMath O Saflen/aPerthynasConsists ofNPRN95469TeitlElan Aqueduct, Elan Valley Water Scheme, Birmingham Corporation WaterworksMath O Saflen/aPerthynasPart of