Hi,
It is the camshaft chain tensioner.
Here's a diagram that may be of some assistance. In the following diagram it is item 13550. Also notice there is a gasket (13550B), and this is what you may need. I can check my EPC and find out the proper part number, but my EPC doesn't cover the 2T-GEU engine - so I would only be assuming the gaskets are identical between the 2T-G and the 2T-GEU.
seeyuzz
river
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