Yes, they do have not only spare parts but some that have improved since the release of the Subtank. Do a web search with the keywords "kangertech subtank parts" and look for the word
mcssl in the url. This should bring you to the US Kangertech website. The Subtank parts will be listed as the last green linked item on the right, about
three quarters of the way down. So far it's the only location I can see that sells the spare parts, and since its sold from Kangertech you can be sure they are not cloned parts. What worries me is that I do not see the Subtank listed on the site for sale, just the mini and nano. Wondering if there is a redesign going on? Anyway, I hope this helps...