Culligan M1 Series Installation, Operation And Service Instructions page 14

Tubing Configuration
From Membrane
Product Tube (1/2" Tube)
Return Assembly Tube
10 Culligan® M1 Series Reverse Osmosis
System Product Water (3/8" Tube)
System Waste Concentrate (3/8" Tube)
To Membrane Feed (1/2" Tube)
Figure 9. M1 Series tubing configuration.
Pressure Gauge Tube
From Membrane
Concentrate (3/8" Tube)
System Inlet
(1/2" Tube)
10 Cat. No. 01022940