These are for 3" standard PVC pipes.

I put GE Silicone #1(https://www.amazon.com/GE-Silicone-Purpose-Caulk-GE012A/dp/B0000CBIH9) inside the edge of the PVC tube and on the inner ring of the print. Squished it together, collected excess, and no leaks or strength problems

I found that anything less than 100 percent infill causes leaks.

edit After experimenting, the 1/2 inch connectors always seemed to not drain enough. Unless you want a trickle system, I'd recommend staying with the standard 3/4 in converter.

Creality

Ender 5

No

No

.2

100