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Moen Solutions

Single Handle 4" Centerset Knob: Flat Cap (Prior to 2009)

Moen produces a variety of single handle bathroom faucets. The interior components and assembly are not the same for each model. This article will explain one of the more common handle assemblies referred to as a Flat Cap Knob. This version of the faucet was produced through 2009, and utilizes a 1225 cartridge.


1225 knob breakdown.png


  1. Carefully pull the cap (#1) out of the handle (#3).
  2. Using a Phillips screwdriver, remove the handle screw (#2). Lift off the handle (#3).
  3. Slide the stop tube (#4) off the faucet.

For replacing the cartridge, see article 1225 Cartridge: Single Handle Bathroom Faucets (Prior to 2009).


  1. Slide the stop tube (#4) back on.
  2. Place the handle (#3) onto the faucet.
  3. Using a Phillips screwdriver, install and tighten the handle screw (#2).
  4. Snap the cap (#1) onto the handle (#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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