While I was under my car today unsuccessfully wrestling with the brakes, I thought I'd replace my 710N with a new one I bought a while ago. The bottom connector has been off before as it is now a worm drive jubilee clip, the other two are factory. It has the smallest pipe retainer I have ever seen. It is a small steel clip which covers the vacuum pipe connector. Now, does the vacuum pipe need a clip to retain it? And if so, what do those of you who have replaced it use?