This kit is obsolete.  We have a small number of new "old stock" kits in stock but will not be able to re-order.  They come with the parts you need to repair a Thetford waste valve with a stainless or bronze cover (as found on many 1960s Airstreams and other trailers of that era).  Kit includes a new stamped stainless steel cover, a new perimeter seal, a new valve seal and four brass eyelets.