The best way to join stacked IBC toes together..vent + water level!

Here is a video showing how I connected my two stacked IBC totes together for rainwater collection and irrigation....
Watertight IBC lid: amzn.to/3SjaKrU
1/2 Inch Diameter Clear PVC: amzn.to/3fci9uL
Bulkhead Tank Fittings: amzn.to/3BINqgi