6.5" x 4.75" NuTone / M&S 35° Intercom Retrofit Adapter for Ring Wired Doorbell 4K Pro (3rd 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 substantial side angle for improved camera positioning. This 6.5" × 4.75" three-piece 35° intercom retrofit adapter by Hidden River Lab is designed exclusively for the newest Ring Wired Doorbell 4K Pro (3rd Gen), Model 5DFYA2, featuring Retinal 4K video.

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 Ring Wired Doorbell 4K Pro.

The three-piece interlocking design consists of a base plate, interface, and 35° corner mount. Both interlocking connections use positive snap-fit engagement reinforced with screws, providing a clean, secure finished installation.

The built-in 35° horizontal side angle helps redirect the camera toward your entryway and approach path when a straight installation would point too far along the wall. The reversible design allows the doorbell to be angled 35° left or right, depending on the doorway layout and desired viewing direction.

This adapter is particularly useful for installations on side walls positioned perpendicular to the front door. The stronger 35° angle can help bring the walkway leading to the entrance, the adjacent yard, and the area where visitors stand near the door into the camera's field of view, depending on the installation position.

This adapter is specifically designed for the physical mounting requirements of the Ring Wired Doorbell 4K Pro (3rd Gen). It is not a universal Ring doorbell adapter and is not interchangeable with adapters made for other Wired or Battery Doorbell models.

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Compatibility

✔︎ Designed exclusively for:
▪︎ Ring Wired Doorbell 4K Pro (3rd Gen) — Model 5DFYA2.
✔︎ 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 35° horizontal side angle (no vertical tilt).
✔︎ Orientation: Reversible configuration for left or right 35° camera positioning.
✔︎ Mounting surface: Flat, stable surfaces.
✔︎ Ideal mounting layout: Side walls positioned perpendicular to the front door, where additional horizontal camera rotation is beneficial.
✔︎ Application: Replacing a legacy intercom door station with the specified Ring wired video doorbell while covering the original opening and improving horizontal camera positioning.

 

✖︎ Not compatible with:
✖︎ Ring Wired Doorbell Plus (2nd Gen) — Model 5DFYA3, also marketed as Wired Doorbell 2K Plus.
✖︎ Ring Wired Doorbell (2nd Gen) — Model 5DFYA4, also marketed as Wired Doorbell 2K.
✖︎ Previous generations of Ring Wired Doorbell Pro, Wired Plus, and other older Ring Wired Doorbell models.
✖︎ 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 made exclusively for Ring Wired Doorbell 4K Pro (3rd Gen), Model 5DFYA2. Ring periodically updates product names and generations. Please verify your exact doorbell model number before ordering. Visually similar Ring doorbells may have different mounting requirements.

Viewing angle: The 35° horizontal angle can be configured to face either left or right. Camera coverage depends on the mounting location, doorway layout, surrounding walls, and the doorbell's field of view. Confirm that the selected angle is appropriate for your installation.

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. The doorbell must be powered and installed according to Ring's specifications.

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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 interlocking snap-fit attachment mechanism.
▪︎ 1 × Reversible 35° corner mount with interlocking snap-fit attachment mechanism, designed specifically for Ring Wired Doorbell 4K Pro (3rd Gen).
▪︎ Machine screws to secure the interface to the base plate.
▪︎ Self-tapping screws to secure the 35° 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".
▪︎ Adapter construction: Three-piece design — base plate, interface, and 35° corner mount.
▪︎ Doorbell compatibility: Ring Wired Doorbell 4K Pro (3rd Gen), Model 5DFYA2 only.
▪︎ Horizontal angle: 35°.
▪︎ 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.
▪︎ Recommended location: Side walls perpendicular to the front door or other locations requiring a stronger horizontal camera angle.
▪︎ 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 of 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 35° angle:

The built-in 35° horizontal side angle redirects the doorbell's viewing direction relative to the mounting wall. The reversible configuration allows the camera to face 35° left or 35° right, depending on your 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 35° horizontal angle is suitable for your entryway and select the appropriate left or right configuration during installation.

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Ideal Installation Scenario — Perpendicular Entry Walls

The 35° corner adapter is particularly well suited for doorbell installations on walls positioned perpendicular to the front door — for example, a side wall or recessed entryway return wall where the doorbell would otherwise face along the wall rather than toward the area in front of the entrance.

In this configuration, the 35° horizontal angle helps rotate the doorbell camera toward the entryway and the surrounding approach area. Depending on the mounting location and the camera's field of view, this can help capture a more useful view of:

▪︎ The walkway leading to the front door — helping you see visitors as they approach the entrance.
▪︎ The adjacent front yard — potentially bringing more of the surrounding outdoor area into view.
▪︎ The visitor standing near the doorway — helping include the area immediately in front of the door in the camera's viewing direction.

The result can be a more practical camera orientation compared with a straight 0° mount on the same perpendicular wall. The stronger 35° correction is particularly useful when a smaller horizontal angle does not turn the camera far enough toward the entrance.

Important: The adapter changes the camera's mounting direction but does not increase the doorbell camera's field of view. Actual coverage of the walkway, yard, and visitor area depends on the doorbell's camera specifications, mounting height, wall geometry, and surrounding obstructions. A 35° angle does not guarantee that all three areas will be visible simultaneously.

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Why Choose This Adapter

▪︎ Legacy intercom retrofit: Replace an outdated NuTone, M&S, or similar intercom door station with the newest Ring Wired Doorbell 4K Pro.
▪︎ Opening coverage: Helps conceal the oversized wall cutout left after removing a legacy intercom station.
▪︎ Stronger camera angle: Built-in 35° horizontal correction helps direct the camera toward the entryway when a straight or smaller-angle installation provides insufficient rotation.
▪︎ Ideal for perpendicular walls: Particularly useful for side-wall installations where the mounting surface is perpendicular to the front door.
▪︎ Improved approach visibility: Helps aim the camera toward the walkway, adjacent yard, and visitor area near the entrance, depending on the installation geometry.
▪︎ 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.
▪︎ Model-specific mounting interface: Designed exclusively for the physical mounting requirements of Ring Wired Doorbell 4K Pro (3rd Gen).
▪︎ Secure three-piece construction: Two interlocking snap-fit connections reinforced with machine and self-tapping screws.
▪︎ Positive click engagement: Both interlocking connections provide a distinct tactile and/or audible click when properly engaged.
▪︎ Integrated angle correction: Combines the intercom retrofit adapter and 35° 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 the Ring Wired Doorbell 4K Pro (3rd Gen), Model 5DFYA2. This adapter is not intended for any other Ring Wired or Battery Doorbell model.

▪︎ Step 2 — Prepare the installation. Disconnect power before working with existing wiring. Remove the old intercom door station and safely manage the remaining wiring according to applicable electrical requirements. Do not assume the old intercom power supply is compatible with your Ring 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 35° left or right angle provides the desired camera positioning for your entryway. For installations on perpendicular side walls, orient the corner mount toward the doorway and approach area as appropriate.

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

▪︎ Step 8 — Attach the 35° 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 35° corner mount are fully seated, securely interlocked, and properly fastened before proceeding with the doorbell installation.

▪︎ Step 11 — Prepare the Ring mounting components. Follow Ring's instructions for routing the appropriate doorbell wiring and positioning the original Ring mounting components, if required, on the completed adapter assembly.

▪︎ Step 12 — Mount the doorbell. Install the Ring Wired Doorbell 4K Pro onto the completed 35° 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. Check the camera view to determine whether the walkway, entrance, and surrounding area are adequately visible.

▪︎ 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: The adapter does not replace the electrical requirements of Ring Wired Doorbell 4K Pro. Legacy intercom systems may use different wiring and power supplies. If existing wiring requires modification, or if you are unsure whether it meets Ring's specifications, 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" 35° retrofit adapter, whether you have the correct Ring Wired Doorbell model, or whether the 35° angle is appropriate for your doorway layout? 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.