Miracles in glass just made me a new tank & drilled a 1 1/2" hole in my overflow box (same as my return bulkhead hole). so my question is what size loc line do I use (the hole looks really big)?
However, the outside diameter of 1 1/2" pvc is 1.9"
The largest pipe that will fit through a 1 1/2" hole is 1" with an OD of 1.315" so you'll have a significant gap around it;
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