"tresduo" (.com) is the url for a Polish faucet brand. Their site has several videos (movies. ".mov" = Apple's suffix for a QuickTime video). Although the movies I see there are actually hosted on YouTube and seem to be Flash. 
"tld" usually stands for top level domain.
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The ".cc" domain suffix is the top-level domain (TLD) for the Cocos Islands. However, it is commonly used as an alternative to the ".com" suffix for commercial Web sites.
As for it coming from a "web site" that's certainly possible. While it probably uses a scripting 'language' on the sites server, there's not really a limit on what can be done/sent with the right code. I'd suggest this is likely an error on the plumbing site. OTOH, it could be a phishing message. Either way, I think you're safe... as long as your plumbing doesn't find out your looking at replacing things! 
Most url's are just a <combination of separate bits of info> between those periods ("."). You can search each bit via your favorite search engine and get leads/ideas about what to look for next. Just be careful with the often confusing additional "info" at the end of a url, usually after a "?". That is usually information sent to the owner and may have information that identifies you! As Abe Lincoln said, "Internet Search engines are your friend."