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Ok guys what is this supposed to be? It’s on my 1812 18hp magnum. It’s leaking oil out the top of it and right good amount as it’s the only place I can find a leak. A couple weeks ago I got in a situation where I had to ham down hard on the brakes and then slam wide open forward on a good incline with a trailer hooked to me. Sheared the spring pin at the hydro pump. Got that all apart and back together then I noticed this leaking. Looked all over the internet but can’t find anything,hard to do when you don’t know what to call it! Lol!