{HEAD ~ a base} mounted on {TAIL ~ a bottom} of said housing and provided with a plurality of tubular portions thereon 
{ HEAD ~ a base } mounted on { TAIL ~ a bottom } of said housing and provided with a plurality of tubular portions thereon
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