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I tried to tighten it, but it still leaks, what is this part? It only happens when the water pump is on and once a faucet is turned off.

Short video of it leaking after I turn the water off:
https://files.catbox.moe/ijbbv3.MOV

That's a water filter. Chances are it wasn't drained and froze, cracking the housing on it. Some pumps have them, some don't, so you can remove it and put a short piece of pipe in there to replace it for at least the time being. We discovered one on my brother's toy hauler in a location that takes almost an hour to get into, and there was zilch said about it in any of his paperwork (he got the unit new).

LionDriver wrote: ↑Wed Sep 30, 2020 6:56 pm I tried to tighten it, but it still leaks, what is this part? It only happens when the water pump is on and once a faucet is turned off.
Short video of it leaking after I turn the water off:
https://files.catbox.moe/ijbbv3.MOV

LionDriver
That's a no longer available inline "Shurflo water screen".
This is the replacement: https://www.amazon.com/SHURFLO-255-313- ... B000V2W0GE

Thanks SO MUCH for this post and LionDriver's reply. We found the same issue about 2 hours ago and can now repair. I love this forum!