This bit has very likely cracked as it's cheap plastic
https://www.fcpeuro.com/products/volvo-heater-hose-coupling-850-c70-s70-v70
The part is sub 100 aus from Volvo aus the last time I asked for a price
It comes from Volvo with good quality orings already installed
It saves a few minutes of technician time during assembly at the factory when the car was built
This is the main reason for the change