3M 3MDW201, Installation And Operating Instructions Manual

1.  Open faucet and turn off cold water supply to relieve pressure. 

2.  Select and mark a location under the sink that allows ac-

cess for filter change. You will be connecting to the existing 
line with 3/8” tubing and various fittings not supplied with 
this filter assembly. 

3.  Using filter head assembly as a guide, fasten filter head as-

sembly to wall with fasteners. (See Figure 1) 

  Allow 3” clearance from bottom of replacement fi lter for 

ease of removal.

4.  Place a basin or a towel under the cold water supply valve.  

Remove the cold side riser tubing between your cold water sup-
ply valve to your primary faucet connection. 

5.  Install faucet adapter fitting (Not included, see recom-

mended kit included with 3MDWIKT installation kit) to faucet 
stem. This should be a snug fit. Do not overtighten.  (See 
Figure 2) Ensure the black gasket is inserted into the faucet 
adapter prior to assembly.

  Determine length of 3/8” tubing (Not included, see recom-

mended kit included with 3MDWIKT installation kit) required 
from filter head outlet to faucet adapter by holding tubing in 
place ensuring it is of appropriate length. Do not kink tubing as 
this will impede water flow. If necessary, loop tubing around to 
avoid it being kinked.  Cut tubing straight with a razor knife or 
tube cutter. (See Figure 3)

6.  Insert 3/8” tubing from faucet adapter fitting into the filter 

OUTLET fitting as shown in Figure 5.

7.  Determine length of 3/8” tubing (Not included, see recommend-

ed kit included with 3MDWIKT installation kit) required from 
filter head inlet to cold water supply valve by holding tubing in 
place ensuring it is of appropriate length. Do not kink tubing as 
this will impede water flow. If necessary, loop tubing around to 
avoid it being kinked.  Cut tubing straight with a razor knife or 
tube cutter.  (See Figure 3)

8.  Using a ferrule, nut and tube support (Not included, see 

recommended kit included with 3MDWIKT installation kit), 
slide nut and ferrule over 3/8” tubing, insert tube support 
and connect to the cold water supply valve.  (See Figure 4)  
Insert other end into filter INLET fitting as shown in 
Figure 5.

9.  Remove sanitary protective cap from filter. Ensure both 

o-rings are present on the filter and are seated into grooves; 

Correct Incorrect

Figure 3

Figure 4

Figure 2

• 

Allow a minimum of 3” (7.6 cm) clear space under the system to facilitate fi lter changes.

• 

All components should be accessible and have a suffi cient amount of clearance on all sides of 
the system to facilitate servicing.

Figure 1

IMPORTANT INSTALLATION INSTRUCTIONS

Note: White tube from head is a filter vent tube outlet.  DO NOT remove, kink or obstruct white tube.

3/8” Tubing

3/8” Compression Nut

3/8” Tube Ferrule

3/8” Tube Support

Cold Water
Supply Valve

The following installation instructions described are based on copper plumbing with 3/8” compression 

fittings.  Additional fittings may be required to connect to cold water supply.

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