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https://www.bulkreefsupply.com/metric-to-standard-pvc-adapters.html
the 25mm to 3/4" adapter plus the coupler that I gave you are exactly what I used on the return after removing the barbed fitting from the existing plumbing.
Ooooo. Ok. Now it’s making more sense! I can use the 25mm union As discussed above the same way right?