threaded, 1", thick wall, PVC t
 

Hello Ron, I recently built your 11 plant garden and figured out that if I used a threaded, 1", thick wall, PVC t, I could apply aquarium silicon sealant to the outside of the 2 liter cap and just twist it right in to the threaded t for a secure, leak proof seal. What do you use to paint the exterior of your 2 liter bottles to prevent algae growth? Anything special or will white plastic model spray paint work? Thanks, MattLove your page! Matt

I will give it a try. Did all you members that can't get thin-wall pipe get that.
Vinyl spray paint sticks best found at auto part stores.