Thanks for the info guys.
Just to clarify, I intend to keep them connected 99% of the time- I don't disconnect the two hoses after use, I reel the whole thing in as one. The only time I usually disconnect is to change pole which isn't very often, or to de-tangle the pole hose. However, it's important that when the connection is wound onto the reel between jobs it doesn't leak onto the van floor. I'll give them a shot, even the genuine ones are inexpensive!!👍
I'll probably sort a cover/protector thing out for them too.