What purpose do they serve? Planning on ditching them
Topic
gray things on gravityworks filter
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I think they're supposed to be "bumpers" to protect the cartridge from damage… but I think it's something the marketing wizards came up with
Not sure if it is the bit you meant but the unit is supplied with a shut off clamp.
If you meant the two rocket bottom bits, then yes they are there to protect the unit if you drop it (not that you would but others may…) and protect the hose entry point from dirt or damage.

nix
As Miles stated, they are bumpers to protect the filter from being smashed so easily. Also, they prevent the hoses from being pinched so tightly. I discarded them.
–B.G.–
They are also meant to catch the drip from the dirty water bag and prevent it from contaminating the clean water hose.
I was expecting to see some slimy gray things crawling across a filter! I'm so disappointed!
Bob, do you have a pic of what it looks like without the bumper?
No, do you?
–B.G.–
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