Inlet strainer for Neptunes Cor20 pump.
I made it two piece for easier, support free, printing.
Make sure you flip the lid and print flat side down.
Threads match pump.
The holes are all just under 1/4 inch so the small snails won't go through it.
I had to debur the inside bottom edge of the threaded hole because the first layer squashes a little.
It's modeled using inches instead of millimeters so you will have to convert accordingly for slicing. Simplify3D prompts you and scales correctly. If your slicer thinks the model is in millimeters (it would be tiny) then scale it up 2540% and it should then be right.