mechanical means for stopping and starting flow in a conduit; many types used in firefighting, including gate, foot, clapper (backflow preventers), sprinkler-heads, etc
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}
Wikipedia, The Free Encyclopedia, Glossary of firefighting equipment, Wikimedia Foundation, http://en.wikipedia.org/wiki/Glossary_of_firefight ing_equipment, CA, USA 2012. (Fr Srvc - Amer) {509}