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I’ve also done this with success after having one leak in the middle of a completed section that I didn’t want to completely redoI ran into this issue when I discovered leaks from my UV sterilizer fittings. I found a YouTube video showing how to use a shop vac to apply suction to the PVC plumbing which can then help draw in primer and cement to fill the gaps.
I documented this in my build thread here: https://www.reef2reef.com/threads/s...eefer-xl-425-build.358990/page-4#post-4631292