u/cascadiatree

Hey folks, I have a leak that I am trying to diagnose. For reference I have an 01 4wd and 5speed. Over the past couple months or so I have had to periodically fill my clutch fluid reservoir. Today I noticed there was a good amount of dot 3 fluid leaking onto my front left mud flap. I popped the hood and poked around and I think I have isolated the leak to a metal cap on a hose coming from what I believe is the transmission (pictures for reference). Does anyone know what this is called or has anyone dealt with this before? I can upload more photos if needed.

Thanks in advance!