Hach-Lange PHOSPHAX indoor sc - Manual (Page 73)

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Plumbing and connection options
Figure 29 Option 3 setup
1 Unused heated drain sample lines 5 FILTRAX heated hose
2 Seal plug #3 6 Seal plug #1
3 Heated drain hose 7 FILTRAX sample line
4 Seal plug #1 8 Heated drain tube