The data sheet for the solvent filtration apparatus includes the following illustration for the assembly procedure:

Assembly instructions

I'm not sure how to orient the part in the middle, a stainless steel screen. According to the scheme, its lip must face down, however I'm sure as to what counts as a "lip" here, exactly: an extended part of the metal o-ring, or the side of the ring that is leveled level with mesh:

Side 1Side 2

My understanding is that the orientation on the right is the correct one as in this case the metal mesh is also leveled with the membrane filter surface, but I'd appreciate a literate interpretation.

  • 1
    "Lip" in this sense means an extension. The top photo shows the lip extending upward from the screen.
    – Hot Licks
    Feb 13, 2020 at 13:34
  • 1
    You've confused documentation with document. There's no such thing as a technical documentation because there's no such thing as a documentation. Documentation is a mass noun just like most -ation words. The count noun is simply document.
    – tchrist
    Feb 13, 2020 at 15:06
  • @tchrist Good point, thank you for your correction!
    – andselisk
    Feb 13, 2020 at 15:19

2 Answers 2


The edge of a hollow container or an opening.

Common example: A cup has a lip and it is often also referred to as a rim. In your case, it is the protruding side that moves away from the mesh; so, yes, the mesh side would go up and the side with a void would go down.


I THINK it means that the lip (as seen in the second picture)is at the bottom and the clear view of the mesh (third picture) should be at the top.

I say this as the membrane filter will need the support of the mesh as seen in the third picture.

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