Just guessing here on your model, but maybe yours has a foot pump. I was searching through a 1970 250 coupe last weekend and discovered this model had two hoses coming from the washer bottle in the engine bay. One hose fed up to the washer nozzles and the other fed through the firewall to the foot pump.
That was a first for me!!

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Selling used Mercedes parts on Ebay...always changing...
cdplayer51 take a look!
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