unknown part 1973/450sl

[zeggate]

While checking on aclacking noise from the rear end, I broke a plastic line connected to an odd (2) disc part thats bolted in the rear above the left axle.
I appears to be some sort of valve possibly for vacuum or venting ,one of the lines that were attached to it run under the car along side the brake and fuel lines. I have not been able to figure where the other line goes. Can anyone identify this part and its function . thanks

[autozen]

That is part of the evaporative loss system that keeps hydrocarbons trapped in the fuel tank until they can be drawn into the running engine and burned.

Peter

[zeggate]

Thanks, thats what I like about this site. Information central!