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Message: <blockquote data-quote="Schwepps" data-source="post: 380681" data-attributes="member: 3592">Good point Elixir. Such systems have been in use in chemical plants and storage tank facilities already, but having wiki-ed it just now, it seems they're starting to be mandated in US gas stations in California, and the UK is considering it. At the point of sale, it seems to be more to prevent ground-level ozone pollution than for safety reasons, another green initiative.Come to think of it, that may be why some people here may think there's a vapour recovery system in our pumps! They may have seen the venturi vent hole in the nozzle for the stop-flow pressure sensing system and mistaken that as the hole for the return pipe! <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin    :D" loading="lazy" data-shortname=":D" /> Here's a diagram of the nozzle and how it works: <a href="http://www.wonderquest.com/sleeping-birds-gas-nozzles-cold-hospitals.htm" target="_blank">http://www.wonderquest.com/sleeping-birds-gas-nozzles-cold-hospitals.htm</a></blockquote>