How To Know Which Delta Cartridge I Need

Figuring out which delta cartridge you need can feel overwhelming, but it doesn't have to be. This guide breaks down the process into manageable steps, helping you choose the right cartridge for your specific faucet or shower and avoid unnecessary trips to the hardware store.

Understanding the Basics of Delta Cartridges

Delta cartridges are essential components inside your faucet or shower that control the flow and temperature of water. Over time, these cartridges can wear out, leading to leaks, drips, or inconsistent water temperature. Replacing the cartridge is often a straightforward repair, but selecting the correct replacement is crucial.

Identifying Your Faucet or Shower Model

The first step is determining the exact model of your Delta faucet or shower. This information is your key to finding the correct replacement cartridge. Here's how to find it:

Look for Markings on the Faucet/Shower: Many Delta faucets and showers have the model number printed directly on them. Check around the base of the faucet, under the handle, or on the escutcheon plate (the decorative plate behind the faucet). For showers, look on the showerhead, arm, or escutcheon. The model number might be small and discreet, so look carefully.
Check Your Original Paperwork: If you still have the original installation manual or warranty information, the model number will likely be listed there. This is the most reliable source.
Search Delta's Website: Delta's website often has product catalogs and search tools. You can try searching based on visual characteristics of your faucet or shower if you can't find a model number. They often have exploded diagrams as well.
Use Delta's Online Product Identification Tool: Delta offers online tools where you can upload a picture of your faucet and answer questions to help identify the model.

If you're having trouble finding the model number, take clear photos of your faucet or shower from multiple angles. This will be helpful when you visit a hardware store or consult with a plumbing professional.

Determining Cartridge Type Based on Faucet/Shower Type

Once you know your faucet or shower model, you can narrow down the cartridge types used. Here's a breakdown of common Delta faucet and shower types and their typical cartridges:

Single-Handle Faucets: These typically use a single cartridge to control both temperature and flow. Common cartridges for single-handle faucets are the Delta 1300/1400 series cartridge (often identified by its rotational limit stop) or the Delta MultiChoice Universal cartridge.
Two-Handle Faucets: Two-handle faucets usually have separate cartridges for hot and cold water. Common cartridges include stem cartridges with rubber seats and springs, or ceramic disc cartridges. You'll need to identify whether your faucet uses stems or ceramic discs.
Shower Valves: Shower valves can use a variety of cartridges depending on the valve type. Common options include pressure-balancing cartridges (like those used in Delta MultiChoice valves) or thermostatic cartridges (which maintain a consistent temperature). The MultiChoice Universal valve is very common and allows for easy style changes without altering the plumbing.
Tub/Shower Combinations: These often use a combination of cartridges, one for the shower valve and potentially separate cartridges for the tub spout diverter.

Comparing Your Old Cartridge to Potential Replacements

The most reliable method is to physically remove your old cartridge and compare it to potential replacements. Here's how:

Turn off the Water Supply: Locate the shut-off valves for your faucet or shower (usually under the sink for faucets or in an access panel for showers). Turn them off completely. If you can't find shut-off valves, turn off the main water supply to your house.
Remove the Handle: Depending on your faucet or shower, you may need to loosen a set screw or remove a decorative cap to access the handle screw.
Disassemble the Faucet/Shower: Carefully disassemble the faucet or shower according to the manufacturer's instructions (if available) or by observing how the parts fit together. Take pictures as you go to help with reassembly.
Remove the Old Cartridge: The cartridge is typically held in place by a retaining clip or nut. Remove this clip or nut and gently pull the cartridge straight out. You might need to use pliers or a cartridge puller tool if it's stuck.
Compare the Cartridges: Take the old cartridge to the hardware store or compare it to online images of potential replacements. Pay attention to the following:
- Overall Length: Ensure the replacement cartridge is the same length as the old one.
- Shape and Diameter: Compare the shape and diameter of the cartridge body and any protruding parts.
- Number and Position of Ports: Check the number and position of the water inlets and outlets on the cartridge.
- Stem Type: If it's a two-handle faucet, is it a stem cartridge with rubber seats and springs, or a ceramic disc cartridge?
- Markings: Look for any markings or numbers on the old cartridge that might help identify it.

Don't discard your old cartridge until you've successfully installed the new one and confirmed that it's working correctly. It can be helpful to have it on hand for reference if you encounter any problems.

Using Online Resources and Hardware Store Assistance

Numerous online resources and hardware store staff can assist you in finding the correct delta cartridge.

Delta's Website: Delta's website has extensive resources, including parts diagrams, troubleshooting guides, and a "Where to Buy" tool to locate authorized retailers.
Online Plumbing Supply Stores: Many online plumbing supply stores offer detailed product descriptions, specifications, and compatibility charts.
Hardware Store Staff: Most hardware stores have knowledgeable staff who can help you identify the correct cartridge based on your faucet or shower model or by comparing your old cartridge to their inventory. Bring your old cartridge and photos of your faucet or shower with you.

Understanding Delta Cartridge Series and Part Numbers

Delta uses specific series and part numbers to identify their cartridges. Familiarizing yourself with these can streamline your search.

Delta 1300/1400 Series: These cartridges are commonly used in single-handle faucets and showers with pressure-balancing functionality. They often feature a rotational limit stop that allows you to adjust the maximum hot water temperature.
Delta 1500 Series: These cartridges are typically found in showers and offer thermostatic control, maintaining a consistent water temperature.
Delta MultiChoice Universal Cartridge: This versatile cartridge is designed for use with Delta's MultiChoice Universal valve system, allowing for easy swapping of trim styles without changing the valve body.

Once you've identified the series, you can use the part number (e.g., RP19804, RP47201, etc.) to find the exact replacement cartridge you need. This number is often stamped on the cartridge itself or listed in the faucet's documentation.

Important Note: Generic or aftermarket cartridges may be available as cheaper alternatives to genuine Delta cartridges. While these can sometimes work, they may not offer the same level of performance or durability. It's generally recommended to use genuine Delta replacement parts to ensure compatibility and longevity.

Practical Application: Common Scenarios

Let's look at a couple of practical scenarios:

Leaky Single-Handle Bathroom Faucet: You have a leaky single-handle Delta bathroom faucet and have located the model number under the handle. You search the Delta website for your model number and find that it uses a RP46074 cartridge. You order this cartridge and replace the old one, resolving the leak.
Shower Temperature Fluctuations: Your shower temperature fluctuates unexpectedly. You identify your shower valve as a Delta MultiChoice Universal valve. You suspect the cartridge is the issue and replace it with the recommended MultiChoice Universal cartridge (RP46074 or RP47201, depending on the valve age), restoring stable shower temperatures.

Checklist for Identifying Your Delta Cartridge

Use this checklist to guide your cartridge identification process:

[ ] Locate the model number of your Delta faucet or shower.
[ ] Determine the type of faucet or shower (single-handle, two-handle, shower valve, etc.).
[ ] Turn off the water supply to the faucet or shower.
[ ] Carefully disassemble the faucet or shower.
[ ] Remove the old cartridge.
[ ] Compare the old cartridge to potential replacements (length, shape, ports, markings).
[ ] Consult Delta's website, online plumbing supply stores, or hardware store staff if needed.
[ ] Identify the Delta cartridge series and part number.
[ ] Purchase the correct replacement cartridge.
[ ] Install the new cartridge and reassemble the faucet or shower.
[ ] Test the faucet or shower to ensure proper operation.