A local parts supplier supplied me this part which looks the same as the one in the CD manual for W123 300DT. I have not taken out the old part (does not hold vacuum and leaks oil into the vacuum line), which I plan to do when the weather improves, to compare it's likeness.

My hesitation is, the part has a stamped on it that says "ronak" and that's it! No part number; No star. I tested it with MityVac and it seems to hold vacuum pulling the lever in which indicates that the diaphragm is okay.

Has anyone heard about "ronak"? Is this an OEM part or of the same quality?

Thanks.

P.S. The photo looks the same as what I received but the stamped labelling is not.

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