3-liter bottle cap
Building the second 11-bottle system even though I'm still waiting to order the grow-rocks. I took a 3-liter bottle cap to the hardware store & it will fit tightly inside of 1 1/2" Sch. 40 PVC pipe. Have seen the question asked several times on the site & had to find out. My next system will be a 3-liter bottle one.
Jim Morton III
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