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astm or some other standard test requirement.there's something called listing, the second part. where some listing agency, and the federal government approves listing agencies, has looked at all the test results and then issue as a report that says if this piece of equipment, whatever it is -- like this wonderful new connector -- is used -- >> cupeling. >> excuse me. is used in accordance with the following specific requirement, it will meet the requirements of the following. in other words, the listing says if you do it the right way, we can assure that you this will meet some standards. right? is that more or less correct? >> correct >> and the third part of that -- we have testing, listing. and then the third part is approval. and approval is something that's done at the local level here at the city of san francisco. we typically approve a listed product. like this kupling. occasionally we have somebody come forward saying, look, i have the listing. we say, that's great. but we don't allow to you use it here in san francisco.

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