When was the last time you knocked one of your vacuum lines off around the oil filter housing, only to discover when you tried to reattached it that the fittings were swollen and would just not stay connected? This is a L shaped fitting that fits 115, 116, 123, and 126 chassis.
Vacuum System Rubber Connector - L for Small Hard Line
$3.45
SKU:
DSL-COMLVC 
Product Details
Look below to view the Vacuum Connector Service Kit.
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616 617 Diesel Vacuum Connector Service Kit
For 1975 to 1985 240D 300D 300CD 300TD and 300SD with the 61x diesel engine
FITS THE FOLLOWING: 115, 116, 123, and 126 chassis. Here is a diesel item I have put together that every Mercedes diesel owner should have.