[W126 Coupe] what's that engine part?

[webjamin at att.net]

Hi all,

I've always been told there is no such thing as a dumb question.... well this probably is one. Located just above the oil filter canister there is a large "hex" cap attached with two screws on the side of the block. It appears that there is oil leaking from this.... thing. Can someone please tell me what it is? 

Additionally, is changing the rear rotors fairly strait forward, or are there some tricks I should be aware of? Is there any special tools required for the job? Should  I replace the bearings or re-pack the old ones while the rotors off? 

Thanks in advance,

Lance
1986 560 SEC
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