Moen Shower Valve Maintenance: Understanding The Center Knob Screw Size

Moen offers a variety of single-handle shower trims, with different interior components and assembly methods for each model. The standard valve system utilises a 1225 cartridge and a Phillips screw, which can be removed with a flathead screwdriver. The screw size is typically #8-32 (5/32 diameter) or #10-24 (3/16 diameter). However, there are reports of other screw sizes being used, such as 1/16, 5/64, 3/32, 7/64, and 1/8.

Moen shower handle Allen wrench size

The size of the Allen wrench needed to remove a Moen shower handle can vary depending on the specific model and design of the shower handle. Moen shower handles often have a set screw or hex screw that holds the handle in place.

To determine the appropriate Allen wrench size, you can follow these general steps:

• Identify the type of set screw: Examine the shower handle to locate the set screw, which is usually located underneath the handle or behind a decorative cap. Determine whether the set screw has a hexagonal socket or an alternative type, such as a square or star-shaped socket.
• Measure the set screw socket: Use a set of calipers or a ruler to measure the width across the opposite flats of the set screw socket. This measurement will help you determine the size of the Allen wrench needed. If the set screw has a square or star-shaped socket, you will need a different tool, such as a square or star wrench.
• Obtain the appropriate Allen wrench: Based on the measurement of the set screw socket, select the corresponding size of the Allen wrench. Common sizes for Allen wrenches used in plumbing applications include 1/8", 3/16", 7/32", and 1/4". However, it's possible that a different size may be required for your specific Moen shower handle.

It's important to note that Moen shower handles can vary in design and require different tools for removal. In some cases, specialized Moen handle removal tools may be necessary, especially for older or more complex models. These tools are often available from plumbing supply stores or can be obtained directly from Moen.

If you are uncertain about the correct Allen wrench size or encounter difficulties during the removal process, it is recommended to consult the user manual provided by Moen for your specific shower handle model. The manual may include instructions on handle removal and provide information on the appropriate tools to use. Additionally, Moen's customer support can provide guidance or recommend the correct tool for your particular shower handle.

Moen shower cartridge adapter screw size

The screw size for a Moen shower cartridge adapter depends on the type of valve and handle mechanism your shower system has. Moen produces a variety of single-handle shower valves, which are not assembled or repaired the same way.

For example, if you have a single-handle Moen shower with a Posi-Temp valve, you will need a #10-24 x 1/2” screw, preferably in stainless steel.

If you have a mid-1990s single-handle Moen shower, the screw size is likely 1/16", as standard Allen wrenches are not strong enough to provide the required torque.

It is important to identify the correct screw size and type to avoid damage to your shower system. Incorrect screw sizes can lead to a loose handle, while overtightening can strip the threads.

To repair and service your Moen shower, follow these steps:

• Determine the type of rough-in valve and interior handle mechanism your shower has.
• Identify the style of your handle mechanism.
• Refer to Moen's charts and articles for technical information and repair guidance specific to your valve and handle type.

Additionally, when replacing the cartridge, ensure you have the necessary tools, such as a Phillips screwdriver and a hex or Allen wrench, as well as the Moen cartridge removal tool and cartridge retainer removal tool, which can be purchased separately.

For further assistance, you can contact Moen's customer support or refer to the original documentation that came with your faucet.

Moen shower handle removal

To remove a Moen shower handle, you will first need to determine which type of rough-in valve and interior handle mechanism your shower system has. Moen produces a variety of single-handle shower valves, and they are not all assembled or repaired the same way.

The first step is to identify the type of shower rough-in valve you have. The most common types are the push/pull and rotate valve, the Moentrol valve, the PosiTemp valve, and the M-Core valve.

Once you have identified the type of valve, you can move on to identifying the style of the handle mechanism. The three most common styles are the knob, the lever with a small cap at the front, and the lever with a Hex screw underneath.

If you have a single-handle Moen shower, the handle cover (not the larger trim plate) will need to be removed with a flat-head screwdriver to locate the screw. Use a screwdriver or Allen wrench to loosen and remove the screw. Pull off the handle and set it aside.

In some cases, the shower valve cartridge can be fully accessed after removing the handle. If not, you will need to remove the trim plate, which is the flat backing that sits behind the handle. Use a screwdriver to loosen the screws securing the trim plate to the valve assembly, then slide it off the valve stem.

After removing the trim plate, you can access and remove the shower valve cartridge. Grip the retainer clip with pliers and pull it up and out of the shower valve. Then, grip the shower valve stem and slowly pull out the cartridge. If the cartridge is stuck, you can use a lubricating solution like WD-40 to help remove it.

Finally, you can install a new shower valve cartridge by sliding it into place and securing it with the retainer clip. Turn on the water and test for leaks to ensure the new cartridge is functioning properly.

Moen shower valve types

Moen offers a wide range of shower valves, which are placed behind the wall and connect to the hot and cold water lines to regulate flow and temperature. The company's valves are designed to meet safety standards and prevent sudden surges in hot or cold water.

M-Pact Widespread Valve

The M-Pact Widespread Valve has an 8-16" centre 1/2" IPS connection. It is available in two models, one with a regular price of $124 and the other with a sale price of $124.

M-Pact Posi-Temp

The M-Pact Posi-Temp comes in several varieties, including:

• 1/2" Cold Expansion Pex Connection with Pressure Balancing ($85)
• 1/2" CC Connection with Pressure Balancing ($119)
• 1/2" IPS Connection with Pressure Balancing ($145)

M-Pact Two-Handle Roman Tub Valve

The M-Pact Two-Handle Roman Tub Valve has a 10-24" centre 1/2" CPVC Crimp Ring Pex Connection. It is available at a regular price of $163.

M-Core Valve System

The M-Core Valve System offers consumers more freedom in terms of showering functionality and style. The system includes:

• M-Core Universal Valves: These valves give consumers flexibility in new construction or remodel projects. The 2-Series trim offers temperature control and pressure balance, while the 3-Series trim offers temperature and volume control. Both options include interchangeable mixing valve cartridges.
• M-Core Transfer Valve: This valve can control 2 or 3 showering devices by modifying the transfer cartridge. It has a 1/2" CC/IPS connection and includes pressure-balancing stops and volume control.
• M-Core 4 Port Valve: This valve has two inlets and two outlets, suitable for tub/shower systems. It can also be paired with a transfer valve for multiple showering devices. It comes in two varieties: one with a 1/2" cold expansion PEX connection and stops ($46), and another with a 1/2" CPVC connection with CC/IPS tub outlet connection and stops ($85).
• M-Core 3 Port Valve: This valve comes in three varieties: one with a 1/2" CC/IPS connection ($73), another with a 1/2" cold expansion PEX connection and pressure-balancing stops ($189), and a third with a 1/2" Crimp Ring PEX connection ($51).

Other Moen Valve Models

In addition to the M-Pact and M-Core series, Moen offers several other valve models:

• Model 2570 Posi-Temp® Valve
• Model U361CI M-CORE Transfer Valve
• Model S3102 U By Moen™ Shower Digital Valve
• Model S3104 U By Moen™ Shower Digital Valve
• Model S3371 ExactTemp® ¾” Thermostatic Valve: This valve uses thermostatic technology for precise temperature control and high-volume capability. It can be used in showers ranging from single-head to vertical spas.
• Model S3600 ExactTemp® Thermostatic Volume Control Valve: This transfer valve adds volume control to the ExactTemp's temperature precision. It is designed for two-outlet applications and can be combined with additional volume-control valves for handshowers, body sprays, and other functions.

Moen shower handle installation

To install a Moen shower handle, you will first need to determine which type of rough-in valve and interior handle mechanism your shower system has. Moen produces a variety of single-handle shower valves, and they are not assembled or repaired the same way.

The first step is to identify the type of shower rough-in valve you have. The most common types are the Push/Pull and Rotate valve, the Moentrol Valve, the PosiTemp Valve, and the M-Core Valve. Once you have identified the type of valve, you can refer to the corresponding technical information and articles provided by Moen.

The next step is to identify the style of your handle mechanism. There are three common styles: the knob, the lever with a small cap at the front, and the lever with a Hex screw underneath the handle. Knowing the style of your handle mechanism will help you choose the correct articles and instructions for installation.

When installing the Moen shower handle, it is important to use the correct tools and follow the specific instructions provided by Moen for your particular valve and handle mechanism. In some cases, you may need to use an Allen wrench or a Torx head driver to secure the handle in place. It is recommended to have the correct size and type of tool to avoid damaging the screw or the handle.

If you are unable to find the correct tool size, you may need to clean the screw slot by spraying vinegar into the hole to remove any water deposits. Alternatively, you can try using a Torx head driver or a drill/screwdriver handle with an insert bit to gain a better grip and apply more torque. In some cases, you may need to drill out the screw and replace the handle if it is damaged or stripped.

Frequently asked questions