You're right, Leviton doesn't seem to offer a direct decorator-style receptacle that combines a 20A 125V (5-20R) and 20A 250V (6-20R) NEMA configuration with backwiring.Here's the breakdown of why finding a single device might be difficult and some alternative approaches: Limited Demand

The combined 5-20R/6-20R (or even 5-15R/6-15R in 20A) receptacle is a relatively niche product. The demand isn't high enough to justify manufacturers creating a wide variety of styles and features like backwiring. Most users who need both voltages prefer to use separate dedicated receptacles.

Physical Space Constraints

Trying to cram the robust mechanisms required for a 20A receptacle and the components for both voltage configurations, and backwiring into a standard decorator-sized housing would be challenging. The size of the terminals and wiring space becomes a constraint.*

Code Considerations

Depending on your local electrical code, having both voltages in a single receptacle might raise concerns about accidental misuse or overloading. A qualified electrician should always be consulted.

Alternatives and Solutions

1.

Separate Receptacles

This is the most common and generally recommended solution. Install a standard decorator-style 20A 125V receptacle (5-20R) and a separate 20A 250V receptacle (6-20R). Use a multi-gang decorator plate to cover both. You can easily find 20A decorator receptacles with backwiring. Leviton, Hubbell, and Cooper all make good options. This allows you to choose receptacles with backwiring for both.2.

Combination Plate Adapters (Less Recommended)

There are adapters that allow you to plug a 6-15P/6-20P into a 5-15R/5-20R receptacle. These are generally

NOT RECOMMENDED for permanent installations as they can be unsafe and may violate electrical codes. They are primarily designed for temporary use. Never use an adapter that forces a higher voltage device into a lower voltage outlet.3. Custom Assembly (Requires Expertise)

This is more involved and requires a good understanding of electrical wiring and safety. It would involve using separate components within a larger enclosure. It is not recommended for someone without advanced skills.4.

Contact Leviton/Hubbell/Eaton Directly

While unlikely, it's worth contacting the major manufacturers (Leviton, Hubbell, Eaton/Cooper) directly and explaining your specific needs. They might have something in development or be able to offer a custom solution (usually only for very large orders).

Recommendation

The most practical, safe, and code-compliant solution is to use

separate decorator-style receptacles for 125V and 250V, and choose models with backwiring. This gives you the flexibility to use the features you need and ensures proper wiring.

Important Safety Note: Always consult a qualified electrician for any electrical work. They can assess your specific needs, ensure compliance with local codes, and perform the installation safely. Never attempt electrical work if you are not qualified and experienced. Flag for review