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Moen Solutions

Single Handle 4" Centerset Knob: Flat Cap (After 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 was introduced in 2009, and utilizes a 1255 cartridge.


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  1. Remove the handle cap (#1). Using a Phillips screwdriver, remove the Phillips screw (#2).
  2. Remove the handle (#3).
  3. Use a 3/32" Hex wrench to loosen the hex screw (#4) until the adapter (#5) lifts off. It is not necessary to remove the screw.
  4. Pull the handle dome (#6) off.

For replacing the cartridge (#7), see article 1255 Cartridge: Single Handle Bathroom Faucets (After 2009).


  1. Snap the handle dome (#6) back onto the faucet.
  2. Place the adapter (#5) on top of the stem of the cartridge (#7) and tighten the hex screw (#4) with a 3/32" Hex wrench.
  3. Place the handle (#3) onto the adapter (#5). Thread the Phillips screw (#2) back in.
  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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