Large Diameter Hose (LDH) 1 : Fire hose with a diameter of 3 1/2 inches or greater. LDH is typically used to supply water from a fire hydrant to fire apparatus such as an engine or tanker
Wikipedia, The Free Encyclopedia, Glossary of firefighting terms, Wikimedia Foundation, CA, USA 2012. http://en.wikipedia.org/wiki/Glossary_of_firefight ing_terms, (Fr Srvc - Amer) {510}