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Most of those Bosch units run a plastic cap at the tip.
I will remove them and leave them off.
To seal the tip of the unit to the engine, I cut a length of 10mm (I.D.) silicone hose.
You can use a section of 3/8" (I think that's the SAE equivalent to 10mm?) heater hose if 10mm vacuum hose isn't easily available.
No need to worry about protecting the tip, since they are all protected in our engines.
-Ted
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