Not sure but I have never blown a hose (the rubber bit) since they did.
They will eventually wear out, the aluminium where the nut and o ring sit gets too marked and the o ring wont seal properly, this will be about 300000kms but.
The old way the rubber hoses got brittle and if you had to move the pump to do a repair they would usually spring a leak a week later.
I used to get Enzed to make me proper hoses that would last longer
There were several early AU's and E series that burst a P/S hose and sprayed it onto the manifold and caught fire.
I think it is a better way, after I had the heart attack at the price of changing the entire hose, I did the nut fix early on, despite everyone telling me it wasn't possible.
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