I had a B34 (2002) and had the same thing. Interestingly though, I also had that ‘washer’, and believed it was a part of the elbow which had came away when I pulled the hose off.
Yes, amazing how they corrode, I changed mine to a SS one, I sold the boat a year later so I don’t know how its holding up compared to the OE Volvo one. Even more scary, I left it in the shed at home, as you do! and a number of months later I came across it and it had literally split its self in half!
I also changed the Volvo water trap/silencer because of corrosion but put an original back on.
