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Moen Solutions

Two Handle 4" Centerset Knob: Flat Cap (After 2017)

Moen produces a variety of two handle bathroom faucets. The interior components and assembly are not the same for each model. This article will explain one of the most common handle assemblies referred to as a Flat Cap Knob. This faucet style utilizes a 1234 cartridge.

Preparation: The water supply shut off valves must be turned off- see article How to Turn Off the Water Supply to the Faucet.

2h centerset knob cap 1234.png


  1. Pry the cap (#1) off.
  2. Push and hold down on the knob (#3) while rotating the retainer clip (#2) until the retainer clip (#2) pulls off.
  3. Lift the knob (#3) off. There is a spring inside the knob (#3) that will come off with the knob (#3).
  4. Remove the gray plastic escutcheon ring (#4).

To replace the cartridge see article 1234 Cartridge: Two Handle 4" Centerset Bathroom Faucets.


  1. Place the gray plastic escutcheon ring (#4) on top of the faucet.
  2. Set the handle (#3) on the faucet.
  3. Push and hold the knob (#3) down while sliding the retaining clip (#2) over the stem of the cartridge (#6) and rotate the retaining clip (#2) 1/4 turn clockwise.
  4. Push the cap (#1) back in the top of the knob (#3).

For additional information on Moen products visit and select the type of product you are repairing. The guide will contain repair details, troubleshooting and specific information on assembling handles associated with that style of product.

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