A fire department sprinkler connection typically consists of a Siamese connection with how many 2-1/2 inch connections?

• A. Clappered Siamese Three
• B. Siamese, Two
• C. Gated Wye, Two
• D. Post Indicator Valve, Two

Answer: (B)

A fire department connection is designed to allow water to be supplied from engines into a building’s sprinkler or standpipe system, and a Siamese arrangement combines two separate feeds into one. The typical setup uses two 2-1/2 inch connections. This matches the standard supply lines carried by fire engines and enables two separate pumpers or two attack lines to connect simultaneously, increasing flow into the system and reducing bottlenecks. It also provides a straightforward, quick connection for firefighters needing to deliver water quickly.

Other configurations described would either change the number of inlets or the type of valve arrangement, which isn’t the common fire department connection for sprinklers.