Hi @tylerssims,
Sorry about the confusion here, we’ve removed the product page for the old aluminium enclosure because they’ve sold out, and the revised (locking) version will be in a combined product page of multiple tube sizes, which hasn’t been made public yet because the new locking enclosures haven’t yet been released.
The 4" (and 3") locking enclosures are definitely still on the way (with multiple lengths, and both aluminium and acrylic options), and I’ll try to get our website tags and notes sorted out so it’s clearer that that’s the case 
I believe they’re still expected to be released this month, but you can contact sales@bluerobotics.com if you’ve got particular questions