I think I found it!
The 2" pots used in DWT are about 2" too short to work in NFT, unless you flood your pipes halfway which is not NFT anymore.
Unfortunately, I can't find these anywhere else or find a bulk reseller.
Interesting. What size pipe were you thinking of using these in?
Actually the hdpe stuff i'm using is slightly less than that.
It made my wheels turn. Thanks.