tgstation/-tg-station — pull request #2026 by Jordie0608 (2013-12-12 17:39:55+00:00)
Title: [MAP] Removed digital valves from atmos

... and replaced them with standard pumps because to my knowledge they're vestigial and unwrenchable; their function of allowing the AI to manipulate gas flow is better served by the atmos computers and a normal pump.