What part is this
Hi Bimmer family, driving down the road today and my temp alarm came on and started to get steam coming from under hood. I pulled over and found where the nipple holding a coolant hose broke off. hose is fine, no dry rot. not alot of antifreeze anywhere. had water pump replaced by local euro shop in 2013. can't find part on rockauto or googling schematics. 2006 325i American bought car. Thanks in advance!