6.5" x 4.75" NuTone / M&S 25° Intercom Retrofit Adapter for Ring Wired Doorbell 2K Plus & 2K (2nd Gen)

Overview

Replace a large legacy intercom door station with a modern Ring wired video doorbell while covering the original wall opening and adding a built-in side angle for improved camera positioning. This 6.5" × 4.75" three-piece 25° intercom retrofit adapter by Hidden River Lab is designed specifically for Ring Wired Doorbell 2K Plus (Model 5DFYA3) and Ring Wired Doorbell 2K (Model 5DFYA4).

These models were previously known as Ring Wired Doorbell Plus (2nd Gen) and Ring Wired Doorbell (2nd Gen), respectively. The adapter supports these two models only and is not interchangeable with adapters for other Ring doorbells.

Designed for many NuTone / M&S (Music & Sound) legacy intercom installations and similar-size openings, the adapter helps cover the oversized wall cutout left after removing an old intercom door station. It creates a purpose-built angled mounting interface for the compatible Ring wired doorbell.

The three-piece interlocking design consists of a base plate, interface, and 25° corner mount. Both interlocking connections use positive snap-fit engagement reinforced with screws for a clean, secure finished assembly.

The built-in 25° horizontal side angle helps aim the camera toward your entryway or approach path when a straight mounting position does not provide the desired viewing direction. The reversible configuration allows the doorbell to be angled 25° left or right, depending on the installation layout.

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Compatibility

✔︎ Designed exclusively for:
▪︎ Ring Wired Doorbell 2K Plus — formerly Ring Wired Doorbell Plus (2nd Gen), Model 5DFYA3.
▪︎ Ring Wired Doorbell 2K — formerly Ring Wired Doorbell (2nd Gen), Model 5DFYA4.
✔︎ Retrofit application: Many older NuTone / M&S intercom door stations and similar-size legacy intercom openings.
✔︎ Adapter size: Approximately 6.5" × 4.75".
✔︎ Viewing angle: Built-in 25° horizontal side angle (no vertical tilt).
✔︎ Orientation: Reversible configuration for left or right 25° camera positioning.
✔︎ Mounting surface: Flat, stable surfaces.
✔︎ Application: Replacing a legacy intercom door station with either supported Ring wired 2K doorbell while covering the original opening and improving camera positioning.

 

✖︎ Not compatible with:
✖︎ Ring Wired Doorbell 4K Pro (3rd Gen) — Model 5DFYA2.
✖︎ Previous generations of Ring Wired Doorbell Pro, Wired Plus, and older Ring wired doorbells.
✖︎ Ring Wired Doorbell Elite models, including Ring Wired Doorbell 4K Elite.
✖︎ All Ring Battery Doorbell models, including Battery Doorbell 4K Pro, 2K Plus, 2K, and previous generations.
✖︎ Doorbells from other manufacturers, including Nest, Eufy, Arlo, Wyze, Blink, Amcrest, and other brands.
✖︎ Non-flat mounting surfaces requiring specially shaped siding, brickmold, or other profile-specific adapters.
✖︎ Additional third-party angle adapters or mounting accessories unless specifically confirmed as compatible.

 

Important: This adapter is compatible only with Ring models 5DFYA3 and 5DFYA4. Ring periodically updates product names and generations. Please verify your exact doorbell model number before ordering. Visually similar models may have different mounting requirements.

Viewing angle: The 25° horizontal angle can be configured for either left or right camera positioning. Confirm that the selected angle is appropriate for your doorway layout and intended viewing direction.

Electrical compatibility: This is a mechanical mounting adapter only. It does not convert legacy intercom wiring, provide electrical power, or guarantee that existing intercom wiring is suitable for a Ring wired doorbell. Follow the electrical requirements for your exact Ring model.

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What's Included

▪︎ 1 × 6.5" × 4.75" base plate — designed to cover the original legacy intercom opening.
▪︎ 1 × Interface with an interlocking snap-fit attachment mechanism.
▪︎ 1 × Reversible 25° corner mount with an interlocking snap-fit attachment mechanism, designed for the two supported Ring Wired Doorbell models.
▪︎ Machine screws to secure the interface to the base plate.
▪︎ Self-tapping screws to secure the 25° corner mount to the interface.
✖︎ Not included: Ring doorbell, original Ring mounting components, legacy intercom components, wall-mounting screws, wall anchors, electrical transformer, and wiring accessories.

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Fit & Measurements

▪︎ Overall adapter size: Approximately 6.5" × 4.75".
▪︎ Construction: Three-piece design — base plate, interface, and 25° corner mount.
▪︎ Doorbell compatibility: Ring Wired Doorbell 2K Plus (5DFYA3) and Wired Doorbell 2K (5DFYA4) only.
▪︎ Horizontal angle: 25°.
▪︎ Orientation: Reversible left/right configuration.
▪︎ Vertical tilt: 0° — no upward or downward inclination.
▪︎ Mounting application: Legacy NuTone / M&S intercom retrofit installations on flat surfaces.
▪︎ Opening coverage: Intended to cover many existing 6.5" × 4.75" legacy intercom mounting areas and similar-size openings.
▪︎ Existing mounting points: May be reused where appropriate, depending on the original intercom installation.

Understanding the dimensions:

The 6.5" × 4.75" measurement refers to the overall adapter plate size intended to cover the original intercom mounting area. It does not guarantee that every opening with similar nominal dimensions will be completely covered.

Legacy intercom systems may have different wall cutouts, screw positions, recessed housings, and mounting arrangements. Please compare the existing opening with the adapter dimensions before ordering.

Understanding the 25° angle:

The built-in 25° horizontal side angle redirects the doorbell's viewing direction relative to the mounting wall. The reversible configuration allows the camera to face 25° left or 25° right, depending on the doorway layout and intended viewing area.

Both directions are supported by the same adapter. No separate left-hand or right-hand version is required.

→ Intercom systems and wall openings vary. Measure your existing opening and check the surrounding mounting surface to confirm that the adapter will provide sufficient coverage.

→ Check the viewing direction. Confirm that a 25° horizontal angle is suitable for your entryway and select the appropriate left or right configuration during installation.

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Why Choose This Adapter

▪︎ Legacy intercom retrofit: Replace an outdated NuTone, M&S, or similar intercom door station with a modern Ring Wired Doorbell 2K Plus or 2K.
▪︎ Opening coverage: Helps conceal the oversized wall cutout left after removing a legacy intercom station.
▪︎ Improved camera positioning: Built-in 25° horizontal correction helps direct the camera toward the entryway or approach path instead of along the wall.
▪︎ Left or right positioning: Reversible configuration accommodates different doorway layouts without requiring separate left-hand and right-hand versions.
▪︎ Clean finished appearance: Creates a purpose-built angled mounting surface instead of leaving an exposed or mismatched wall opening.
▪︎ Two-model compatibility: One adapter design supports Ring Wired Doorbell 2K Plus (5DFYA3) and Wired Doorbell 2K (5DFYA4).
▪︎ Secure three-piece construction: Two interlocking snap-fit connections reinforced with machine and self-tapping screws.
▪︎ Positive click engagement: Both connections provide a distinct tactile and/or audible click when fully engaged.
▪︎ Integrated angle correction: Combines the intercom retrofit adapter and 25° corner mount into one purpose-built assembly.
▪︎ Outdoor-ready construction: Manufactured from durable 3D-printed plastic intended for everyday outdoor applications.

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Materials & Finish

♺ Made from durable, outdoor-ready 3D-printed plastic.
▪︎ Designed and manufactured by Hidden River Lab.
▪︎ New condition.
▪︎ Intended for everyday outdoor mounting applications.
▪︎ Minor cosmetic artifacts may be visible due to the additive manufacturing process, especially on internal or non-visible surfaces.
▪︎ External surfaces are designed to provide a clean finished appearance once installed.

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Installation Notes

Basic mounting tools may be required (e.g., screwdriver). Follow Ring's instructions for electrical connections, power requirements, and final doorbell installation.

▪︎ Step 1 — Verify compatibility. Confirm that your doorbell is Ring Wired Doorbell 2K Plus (5DFYA3) or Ring Wired Doorbell 2K (5DFYA4). This adapter is not intended for other Ring models.

▪︎ Step 2 — Prepare the installation. Disconnect power at the circuit breaker before handling existing wiring. Remove the old intercom door station and safely manage any remaining wiring. Do not assume that the original intercom wiring or power supply is suitable for a Ring wired doorbell.

▪︎ Step 3 — Install the base plate. Position the 6.5" × 4.75" base plate over the old intercom opening and secure it to the wall using appropriate mounting hardware for the installation surface. Reuse existing mounting locations where suitable.

▪︎ Step 4 — Attach the interface. Align the interface with the base plate and press firmly until the interlocking mechanism engages. You should feel and/or hear a distinct click when the interface is fully seated.

▪︎ Step 5 — Secure the interface. After the interface clicks securely into the base plate, secure the assembly with the included machine screws.

▪︎ Step 6 — Select the viewing direction. Determine whether a 25° left or right angle provides the desired camera positioning for your entryway. Orient the corner mount accordingly.

▪︎ Step 7 — Plan the wiring route. Before closing the angled assembly, ensure that compatible doorbell wiring can be routed correctly without being pinched, following Ring's instructions for the selected model.

▪︎ Step 8 — Attach the 25° corner mount. Align the corner mount with the interface and press firmly until its interlocking mechanism engages. You should feel and/or hear a second distinct click when the corner mount is fully seated.

▪︎ Step 9 — Secure the corner mount. After the corner mount clicks securely into place, secure it with the included self-tapping screws.

▪︎ Step 10 — Verify the assembly. Confirm that the base plate, interface, and 25° corner mount are fully seated, securely interlocked, and properly fastened before proceeding with the doorbell installation.

▪︎ Step 11 — Prepare the Ring mounting components. Route appropriate wiring and position the original Ring mounting components, if required, following the instructions for your exact Ring model.

▪︎ Step 12 — Mount the doorbell. Install the compatible Ring wired doorbell onto the completed 25° adapter assembly using the appropriate mounting hardware and following Ring's instructions.

▪︎ Step 13 — Verify camera positioning. Confirm that the adapter is securely fastened, the doorbell is properly mounted, and the camera is directed toward the intended viewing area.

▪︎ Step 14 — Complete setup. Follow Ring's instructions for electrical connections, power restoration, device setup, and final operation.

For best results, install on a flat, stable surface and weather-seal the installation as appropriate for your wall, opening, and outdoor environment.

Electrical safety: This adapter does not replace the electrical requirements of Ring Wired Doorbell 2K Plus or Wired Doorbell 2K. Legacy intercom systems may use different wiring and power supplies. If existing wiring requires modification or compatibility is uncertain, consult a qualified electrician.

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Color & Image Note

Actual product color may vary slightly due to lighting, photography, and display calibration. Images may show Ring doorbells, original Ring mounting components, legacy intercom components, or example installations for illustration purposes. These components are not included unless explicitly stated.

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Disclaimers & Policies

Brand & Affiliation Disclaimer

This is an aftermarket intercom retrofit adapter made by Hidden River Lab. Hidden River Lab is not affiliated with, sponsored by, or endorsed by Ring, NuTone, or M&S. Ring®, NuTone®, and M&S® are trademarks of their respective owners. Brand names are used solely to identify product compatibility and intended retrofit applications.

Liability Disclaimer

Installation and use of this product are the purchaser's responsibility. To the extent permitted by applicable law, Hidden River Lab is not liable for damage to devices, wiring, mounting surfaces, exterior finishes, or property; loss of functionality; or personal injury resulting from improper installation, misuse, unauthorized modification, inadequate sealing, or unsuitable environmental conditions. If unsure about installation, consult a qualified professional. Nothing in this notice limits rights or remedies that cannot legally be excluded.

Intellectual Property Notice

The product design, images, text, and related listing content are intellectual property of Hidden River Lab. Purchasing this item does not grant any license to copy, reproduce, manufacture, reverse-engineer, or commercially exploit the design in whole or in part.

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Support

Not sure whether your old NuTone / M&S intercom opening matches this 6.5" × 4.75" 25° retrofit adapter, which Ring Wired Doorbell model you have, or which direction you need the 25° angle? Send us photos of your doorbell, its exact model number, and photos or measurements of the old intercom opening and surrounding entryway. We'll help verify compatibility, mounting coverage, and the appropriate viewing direction before ordering.