That hose is the battery acid vent tube. In the older original lead acid batteries, they connected like in the top pic below. In the newer AGM batteries, I had to remove the black connection which is too wide, and connected the see thru hose to a smaller black adapter to fit in the smaller hole in the AGM Battery (Lower pic). I find that even techs at dealers are too lazy to reconnect the vent tube when replacing batteries, so I end up doing it myself. i can see the vent tube hole in your battery in your pic above (in same location as mine in the pic below btw).
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Current: 07 Carrera S Cab in Midnight Blue
Previous: 01 Boxster in Arctic Silver, 86 944 in Guards Red
Last edited by Boxtaboy; 04-08-2017 at 04:34 PM.
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2001 Porsche Boxster
2007 Carrera S Cabriolet
Hybrid Mode
