Does it matter? It matters to me.

What is done can be undone because I retained the replacement air tube and cut down the old one.

My concern is why does an OEM part not fit in the tank? I notice aftermarket manifolds have either an angled tube, flex hose, or no tube at all because they have built in air relief systems that are flush with the manifold.

This is my first experience with a DE filter. Also, the grid assembly does not rest in the bottom of the tank. It is suspended by the outlet tube. Seems the tube is too long, or the grids are to short, or the top section of the tank is too small.

It's possible the top was replaced with the wrong size. There is no model number on the top but the bottom indicates Pentair FNS 60 which is the largest version.

I just needed advice from those with experience with DE filters as this has not been a "plug and play" project for me.

Thanks.