Introduction
The Delta Faucet RP25513 Stem Assembly is a genuine replacement part designed for two-handle faucets. This sturdy unit is crucial for controlling water flow and temperature, ensuring your faucet operates smoothly and efficiently. Constructed with a brass stem and stainless steel plate, it offers enhanced durability and reliability for long-term performance. This part is intended for repair and maintenance of existing Delta two-handle faucet systems.

Image: Delta Faucet RP25513 Stem Assembly. This image displays the stem assembly, featuring a brass hexagonal top, a light-colored plastic body, and a black O-ring around its circumference. The bottom part of the assembly shows a metal plate.
Setup and Installation
Proper installation of the RP25513 Stem Assembly is essential for optimal faucet performance. Always ensure the main water supply to the faucet is turned off before beginning any installation or repair work.
Tools Required:
- Adjustable Wrench or Pliers
- Screwdriver (Phillips or Flathead, depending on faucet handle screws)
- Rag or Towel
- Replacement O-rings and Springs (Note: These are typically sold separately and are not included with the RP25513 stem assembly.)
Installation Steps:
- Turn Off Water Supply: Locate the shut-off valves for your faucet (usually under the sink) and turn them clockwise until the water flow stops completely. Turn on the faucet handles to drain any remaining water and confirm the supply is off.
- Remove Faucet Handle: Carefully remove the decorative cap (if present) on the faucet handle. Use a screwdriver to loosen and remove the screw securing the handle. Lift the handle off.
- Remove Retaining Nut/Bonnet Nut: Use an adjustable wrench to loosen and remove the large retaining nut (often called a bonnet nut) that holds the stem assembly in place. Turn counter-clockwise.
- Extract Old Stem Assembly: Carefully pull out the old stem assembly from the faucet body. Be prepared for a small amount of residual water.
- Inspect and Replace Seals: Inspect the O-rings and springs located at the bottom of the faucet body where the stem sits. If they appear worn, flattened, or damaged, replace them with new ones. This is a critical step to prevent future leaks.
- Insert New Stem Assembly: Place the new Delta RP25513 Stem Assembly into the faucet body, ensuring it is properly seated. The part may have either a black or beige color, which does not affect its function.
- Secure Retaining Nut: Hand-tighten the retaining nut back onto the faucet body, then use the adjustable wrench to tighten it securely, but do not overtighten.
- Reattach Faucet Handle: Place the faucet handle back onto the stem, align it correctly, and secure it with the screw. Replace the decorative cap.
- Restore Water Supply: Slowly turn the water shut-off valves back on. Check for any leaks around the faucet base and handle.
- Test Faucet: Operate the faucet handles to ensure smooth rotation and proper water flow.
Operating the Stem Assembly
The RP25513 Stem Assembly functions as the internal mechanism that allows your two-handle faucet to control water. When the faucet handle is turned, the stem assembly rotates, opening or closing internal valves to regulate the flow of hot or cold water. Its design ensures a precise and smooth operation, contributing to the overall functionality of your faucet.
Maintenance
The Delta RP25513 Stem Assembly is designed for durability and long life. Regular maintenance primarily involves ensuring the surrounding components are in good condition. While the stem assembly itself is robust, the O-rings and springs that work in conjunction with it are common wear items. If you notice a decrease in performance, such as leaks or stiff handle operation, it is often an indication that these associated seals may need replacement. Periodically check for any visible leaks around the faucet base and handles. Promptly addressing minor issues can extend the life of your faucet system.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Faucet Leaks from Handle Base | Worn or damaged O-rings/seals beneath the stem assembly. | Replace the O-rings and springs. Ensure the new RP25513 stem assembly is properly seated. |
| Stiff or Hard-to-Turn Handle | Mineral buildup or worn internal components of the stem assembly. | Replace the RP25513 stem assembly. Ensure the area is clean before installation. |
| Reduced Water Flow | Debris or mineral buildup within the stem assembly or associated components. | Inspect and clean the faucet's internal pathways. If the stem assembly is clogged, replace it. |
| Dripping Faucet | Worn seals or a faulty stem assembly. | Replace the RP25513 stem assembly and ensure new O-rings and springs are installed. |
Specifications
- Manufacturer: Delta Faucet
- Part Number: RP25513
- Item Weight: 1.13 ounces
- Product Dimensions: 2.13 x 1.25 x 4.88 inches
- Material: Brass (stem), Plastic (body)
- Compatibility: Designed for two-handle Delta faucets
- Key Features: Genuine Delta repair part, sturdy stem unit, brass stem, stainless steel plate for added strength.
- Color Variation: Part will have either black or beige color (referring to internal plastic components).
Warranty Information
Delta Faucet products, including this stem assembly, are backed by a lifetime guarantee. This warranty covers defects in material and manufacturing for as long as the original consumer purchaser owns the home in which the faucet is first installed. For specific details regarding warranty claims or coverage, please refer to the official Delta Faucet warranty policy or contact Delta customer support.
Customer Support
For further assistance, technical support, or to inquire about additional replacement parts, please contact Delta Faucet customer service. You can typically find contact information on the official Delta Faucet website or through the product packaging.
Online Resources: Visit Delta Faucet Official Website





