{HEAD ~ second mounting means} disposed on {TAIL ~ said trap} for alternately mounting said trap on a horizontal wall of said furnace 
disposed on
{ HEAD ~ second mounting means } disposed on { TAIL ~ said trap } for alternately mounting said trap on a horizontal wall of said furnace
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH