Hach-Lange CL17 USER MANUAL - Manual (Page 27)

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Installation
4. Install the two screws through the pinch plate and into the pump/valve module.
Secure the pinch plate by turning the screws in small increments moving from one
screw to the other so that the plate is drawn down evenly. Tighten until the plate is
seated against the pump/valve module.
Figure 17 Installing pump/valve module pinch blocks
1 Pump/Valve module 3 The dissimilar-shaped block should be on top
2 Remove tape from tubes