Attachment IV - Specifications 1.pdf

This is a technical drawing/CAD detail document from the Department of Veterans Affairs depicting a backflow preventer piping configuration. The document, issued December 1, 2015, with CAD Detail No. SD221100-01.DWG, illustrates the installation specifications for a reduced pressure principle backflow preventer system with gate valves designed to prevent contamination of potable water supplies.

The detail shows both plan and elevation views of the backflow preventer assembly, including the water line connection from the meter, the dual check valve and relief valve mechanism (with dimensions of 1'2" by 300mm), air gap fittings, drain pipes, and cold water system connections. The system includes pipe supports and is positioned relative to the finished floor and wall line. The technical specification indicates provisions for a 1'2" (300mm) relief opening and includes standard plumbing components such as gate valves, flanged connections, and support brackets necessary for proper installation and maintenance access in building water systems.