Siamese connection
Encyclopedia
In fire protection engineering
Fire protection engineering
Fire Protection Engineering is the application of science and engineering principles to protect people and their environments from the destructive effects of fire and smoke....

, a Siamese connection is a pipe fitting
Pipe fitting
Pipe fitting is the occupation of installing or repairing piping or tubing systems that convey liquid, gas, and occasionally solid materials...

 that allows two fire hose
Fire hose
A fire hose is a high-pressure hose used to carry water or other fire retardant to a fire to extinguish it. Outdoors, it is attached either to a fire engine or a fire hydrant. Indoors, it can be permanently attached to a building's standpipe or plumbing system...

s to be connected to a single standpipe
Standpipe
In North America, a standpipe is a type of rigid water piping which is built into multi-story buildings in a vertical position, to which fire hoses can be connected, allowing manual application of water to the fire...

 riser at the same general location. It is so-called due to the visual allegory to Siamese twins.
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