1. 
   Handhole
   An opening at the bottom of a downpipe, with a cover-plate. If the pipe chokes the plate can be taken off to allow the pipe to be cleared with rods. Sometimes referred to as a rodding plate. Related Words: Down pipe
   Found op http://www.maintainyourchurch.org.uk/ToolkitModules/Toolkit1Glossary/tabid/
   
   
2. 
   Handhole
   A small manhole, too small for access but useful for inspection and washing out the boiler. See also mudhole
   Found op http://en.wikipedia.org/wiki/Glossary_of_boiler_terms
   
   

Tip: double click on a word to show its meaning.