Here is the piece of hose I cut for mine. The hose came from PP.
About 4 1/2 inches will do, in spite of the perspective in the picture...
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Gilles
Happiness is not having a Porsche in the garage... Happiness is having a Porsche on the road!
86 Porsche 911 Cabriolet, 2015 BMW K1600 GTL, 2011 BMW X3, 2016 BMW 435i hard top convertible