I will have to see what size the pipes are. I had always thought they were 1.5" since that's what size bulkhead it fits. I am hoping these can flow what I need them too. I want about 2000gph split between 2 of them. Also on the durso's and stockmans do you need to have the end of the drain pipe in the sump under the water level? That's how I have these....we got them for my bro n laws tank but his sump wont allow the end of the drain to go uner the water. I am building my sump so I will make it happen on mine....
Actually in those links is the same thing that I have. Look on the bottom it gives some sizes of the 1.5" version I have. Is that what sizes you want or you want me to measure something else....