5mm hair pin clip/lock.  There are two types of hair pin locks used in Jura espresso machines.  The purpose is to lock the connection for pressure/PTFE hoses.  This is the wider of the 2 types of hair pin locks.  Mostly used for the PTFE tubes that are connected to and from the thermoblock.

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For repairs we supply Padded shipping box for $30

and 40% discounted shipping label.