hand-hole

from The Collaborative International Dictionary of English v.0.48

hand-hole \hand"-hole`\ (h[a^]nd"h[=o]l`), n. (Steam Boilers)
   A small hole in a boiler for the insertion of the hand in
   cleaning, etc.
   [1913 Webster]

   {Hand-hole plate}, the cover of a hand-hole.
      [1913 Webster]