PVC-U Socket union BIFV PVC-U Socket union BIFOV PVC-U Socket union BIROV PVC-U Socket union BIFXV PVC-U Socket union BIRXV PVC-U Adaptor coupling DIFV PVC-U Adaptor coupling DIMV PVC-U Adaptor coupling MIFV PVC-U Adaptor coupling MIMV PVC-U Adaptor coupling KIFV PVC-U Adaptor coupling NRIV