Vault 11 : An underground structure, with a minimum volume of 1.0m3, which may be entered, and which is designed to contain piping and piping components (such as valves and pressure regulators)
Ministry of Business, Innovation and Employment, Glossary of terms and acronyms, Wellington, New Zealand 2010. http://wwwsosh.govt.nz/resources/glossary-u.shtml, (Occupn Hlth and Sfty - Brit) {530}