What size outlet is on your pump and Over flow? The best thing to do would to have them the same. Then you dont have to buy 2 sizes of pipe. If not get the size that fits the outlet that is on there. After that Measure and dry fit everything. Once you are happy with it. Glue and let dry. Just make sure the PVC glue is drinking water safe.
MAHA
MAHA
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Panther28