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The size is based on the size of your PVC piping. So if you have 1 1/2" pvc pipe on your overflow then that is the size bulkhead fitting you need.How do I measure a bulkhead fitting to know what size it is for ordering new ones?
Sch 80 is a grey plastic,Note that some tanks have schedule 80 bulkheads, which require a different size hole than a schedule 40.