cooler hose quick coupling with spring loaded check valve?
 

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Hi Guys, hoping for some help?, I recently had a failed EGR Valve on my 2009 3.0 T/D Audi Q7, anyway whilst dismantling engine to remove EGR i broke a 'quick Coupling' for a cooler hose around the size of a heater hose and it had a 'check valve' inside it? I cannot seem to find any info on it on-line and i need to replace it, it was a straight hose fitting around 75mm long with the valve inside it, I didn't take any photos stupidly and I have put the engine back together as we needed it, it is not leaking at present but i will need to do it asap, it would have something to do with the EGR cooling system i think?
any ideas?, i have looked at several exploded views of cooling systems bu cant seem to work it out
TIA