if you type in thos model numbers of the filters you will know what type they are. i dont have a camera,. it has a hole on the left side and a hole on the right side, one side goes into the filter, one side goes out. lol
if you know what "bulkheads" are? i just found the name on goggle. they are almost flush with the bottom and i want to add gravel, but previous owner ssaid i need a pad or the gravel with get sucked into the bulkhead holes about 1/2 in size, they are threaded on the bottom and the 3/4 pvc pipping attaches amd goes to the filter