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Vertical Spa: Independent Transfer Valves

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What is a Vertical Spa?

In 2000 Moen introduced its first line of vertical spa systems. This product launch included small vertical spa systems supporting two devices (the term “device” refers to a showerhead, handheld showerhead, or wall-mounted body sprays).  Over the years, with advances in plumbing technology and requests for advanced functionality Moen has produced 7 vertical spa transfer valves. Transfer valves all require a second valve to provide a water supply to the system, these vary based on the year installed and the transfer valve that was chosen. They include ½” Exact Temp, Moentrol, PosiTemp, or M-Core.

#1-Independent Transfer Valve: The Transfer valve is responsible for moving water from one shower device to another. The escutcheon/backplate is approximately 4" wide. 

Independent Transfer Valve Symptoms: The transfer valve can experience symptoms of low flow to a specific device or is not transferring the water flow to another shower system.

#2-Mixing Valve: The Mixing valve is responsible for turning the water flow to the entire system on and off and controlling the temperature. Certain mixing valves also control the volume of water. The escutcheon/backplate is approximately 7" wide.

Mixing Valve Symptoms: The mixing valve can experience symptoms of a continuous leak or a temperature-specific reduction of flow.

What do I need to know to service my Independent Transfer Valve?

To use this repair guide you will need to identify which transfer valve is used in your shower. The easiest way is by researching your invoice or installation manuals for the valve numbers. This guide contains repair information on all seven transfer valves. If you are unsure of your transfer valve, the resources below will help with the identification process.

Step 1-Reference Chart: This will provide a historical overview of transfer valves and mixing valves systems.

Step 2-Identification by Handle Removal: The second option is to remove the #1-Independent Transfer Valve handle, for more information move to Identification by Handle Removal. 

Step 1-Reference Chart

How do I use this chart to identify my Independent Transfer Valve?

Review the information you have obtained from your invoice or installation manuals and compare it to the chart below.

  • Column 1 lists all seven independent transfer valves.
  • Column 2 provides the historical dates that the transfer valves were in production.
  • Column 3 explains the functions offered with each transfer valve.
  • Column 4 provides the names of the mixing valves that may have been paired with the transfer valve.
CLMN 1: Transfer Valve CLMN 2: Intro/Retired CLMN  3: Functions CLMN  4: Mixing Valve
3500 2000-2006 4 Independent and 1 Shared 1/2" Exact Temp, Moentrol 
3372 2009-2020 2 Independent and 1 Shared Moentrol, PosiTemp, M-Core 2 or 3 Series
3375 2012-2022 2 Independent Moentrol, PosiTemp, M-Core 2 or 3 Series
3360 2011 3 Independent Moentrol, PosiTemp
3362 2018 3 Independent Moentrol, PosiTemp, M-Core 2 or 3 Series
U231 2020 2 or 3 Independent  and 0 Shared PosiTemp, M-Core 2 or 3 Series
U361 2020 2 or 3 Independent and 1 or 3 Shared PosiTemp, M-Core 2 or 3 Series

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Step 2-Independent Transfer Valve Identification by Handle Removal

In this step, you will use the information below to identify your transfer valve. This will require removing the transfer valve trim pieces. 

Preparation:

  • The water supply must be turned off- see the article How to Turn Off the Water Supply to the Faucet.
  • Recommended tools: Phillips Screwdriver, 3/32" Hex Wrench
  • We recommend covering the drain before beginning to avoid losing any parts down the drain.

Each transfer valve is built differently. The two unique characteristics of transfer valves are the location of the handle screw and the mechanism attaching the handle to the valve. To inspect the interior mechanism the handle will need to be removed.

Using the chart below, determine your set screw location. There are different access points to where the screw is holding your handle in place:

  • Plug Button: The screw will be located behind a small plug button at the front of the handle.
  • Under the Handle/Lever: The screw will be located in a small opening underneath the handle/lever.
  • Escutcheon Plate: The screw will be located in a small opening on the underside of the escutcheon/backplate.

Once you've located your screw location use the instruction from the first column to remove the handle. Once the handle has been removed, use the information in the second column and look for screws holding the escutcheon/backplate to the wall. Then match the mechanism type (adapter) to the style of handle mechanism installed on your valve. 

Location of Set Screw? Plug Button Which mechanism matches your system?

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This style of the handle has a small removable cap at the front of the handle concealing a Phillips screw.

Handle Removal Process:

  • Tools Required: Phillips Screwdriver
  • To Remove the Handle: Remove the cap. Using a Phillips screwdriver, unthread the screw and pull the handle forward to be removed. 

Independent Transfer Valve:

3372 (3F) or 3375 (2F)

 

 

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Mechanism Type A

  • Adapter: No
  • Escutcheon Screws: Yes
  • If this is not your handle mechanism style, see Mechanism Type B.

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Mechanism Type B

  • Adapter: Black Plastic
  • Escutcheon Screws: Yes
  • If this is not your handle mechanism style, see Mechanism Type A.

Independent Transfer Valve:

3360 (3F)-Commercial

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Mechanism Type C

  • Adapter: No
  • Escutcheon Screws: None
Location of Set Screw? Under Lever Which mechanism matches your system?

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This style of the handle has a small hole on the underside of the handle that contains a Hex screw.

Handle Removal Process:

  • Tools Required: 3/32" Hex Wrench
  • To Remove the Handle: Using a 3/32' Hex wrench, loosen the screw until the handle can be pulled forward to be removed. 

Independent Transfer Valve:

3500 (5F)

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Mechanism Type D

  • Adapter: Black Plastic or Brass
  • Escutcheon Screws: No

Independent Transfer Valve:

3372 (3F) or 3375 (2F)

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Mechanism E

  • Adapter: Black Plastic or Brass
  • Escutcheon Screws: Yes

Independent Transfer Valve:

3360 (3F)-Commercial or 3362 (3F)

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Mechanism Type F

  • Adapter: Black Plastic
  • Escutcheon Screws: No

Independent Transfer Valve:

U231 (2F or 3F) or U361 (3F or 6F)

 

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Mechanism Type G

  • Adapter: Black Plastic
  • Escutcheon Screws: Yes
Location of Set Screw? Escutcheon Plate Which mechanism matches your system?

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This style of the handle has a small hole on the underside of the decorative handle escutcheon that contains a Hex screw. 

Handle Removal Process:

  • Tools Required: 3/32" Hex Wrench
  • To Remove the Handle: Using a 3/32" Hex wrench, loosen the screw until the decorative handle escutcheon can be lifted off over the handle. 

Independent Transfer Valve:

3372 (3F) or 3375 (2F)

 
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Mechanism Type H

  • Adapter: Beige Plastic
  • Escutcheon Screws: Yes-This system has concealed screws that will only be visible once the decorative handle escutcheon has been removed.

Independent Transfer Valve:

3362 (3F)

 
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Mechanism Type I

  • Adapter: Beige Plastic
  • Escutcheon Screws: Yes-This system has concealed screws that will only be visible once the decorative handle escutcheon has been removed.
Recommended Articles

Troubleshooting Faucet Symptoms: 

Handle Assembly:

Cartridge Replacement:

Parts Installation:

How to Identify or Shop a Moen Product:

Care and Maintenance: 

 

Shower Planning Guide

This is a collection of vertical spa rough-in and design guides that may provide additional information on your system.

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