I have spares for almost everything these days wfp wise....apart from these!
This is the state of a rubber disc washer inside a threaded metal fitting coming out of my heater and going into my reel...its never leaked in 4 years though....I've ordered some more but they won't get delivered until tomorrow so ive got a leaking connector which resulted in losing around 50L of water overnight last night!
The water coming out of this connector is scalding hot too in the day time....van floor is wet through....
It's amazing how a perished rubber washer can cause so much aggro!