Custom made lids with three inch holes for DWC! I have two of these selling each with the custom lid for 100$. 200$ for both! Each reservoir is under 4x4 and fits perfectly in a 4x4 tent to maximize usable growing space. These items can be picked up from me or shipped, but expect shipping to be expensive as these require shipping by freight.
If you want to buy my full setup check out my page, it’s all for sale!