Being a Kickstarter investor for Lab-Box, I got mine early on. Noting the terrific leakage problem with the Rondinax design, this was the first thing I tested. I too got no leaks at all - None. I tested for more than 24 hours, then gave up and called it leak proof. In the event, the seal is easily replaced. Lab-Box originally stated its intent to regularly support the tank and provide these parts, but as far as I know, they never followed through. This lack of long term support for its product is the big disappointment with the maker of the tank. For any L-B owner, I'd look at the accessories which are still available and buy for the future planned need, as support and supply in the US is drying up fast and will be orphaned soon. Note that the L-B was grossly over-funded, yet they still ran out of funds and failed to fulfill their promises to the Kickstarter investors. The maker is a small retailer of photo supplies and has no experience in developing, manufacturing and selling a product as "complex" as this tank, and no financial resources to back up its promises, which they freely made nevertheless.