The locking enclosures are more robust and effective at preventing leaks than the current “normal tube with end caps” approach, and have improved depth ratings as a result. Due to the precision machining required for the locking enclosures to work, we will only be offering those set lengths (which have been chosen to meet the needs of most of our customers), and we won’t be able to continue offering custom-length tubes or the non-locking style of flanges.
As discussed in the original post,
Hope that helps clarify things 