Volvo Forums - Volvo Enthusiasts Forum - coolant leak front passenger side

hello, my 2004 Volvo s60 non turbo has sprung a leak in the front passenger side. I believe I've pinpointed it to a metal cylinder near the radiator but I cannot tell if it its the actual part or the metal pipe that connects to the the firewall.

not mechanically inclined, and not losing a huge amount of coolant(have yet needed to add) but I really enjoy the car now only 106k belt/breather box was changed at 80k, and don't want to ignore a potential issue.

if anyone knows the name of the part, pipe or possible gaskets it would be greatly appreciated. thank you in advance:)