I was wondering what the preferred tightness of the couplings is? Right now I have a 1 mm gap between the two halves, but saw a picture somewhere where this gap was closed.
The latest kit with the black neoprene tubing comes with the manual that says close it fully.
The previous version with PVC tubing needs to have about 1mm gap at the bottom and be closed at the top. The plastic parts are different, see [hydraraptor.blogspot.co.uk]
