DORMAN/AUTOGRADE 493-057 Vacuum Tubing Connector 019495495574 1/4 1/8

( Brand: Dorman/autograde ), ( Manufacturer Part Number: 493-057 ), ( Part Type: Vacuum ), ( Manufacturer Warranty: 1 Year ), ( California Prop 65 Warning: This Product Contains Chemicals Known To The State Of California To Cause Cancer And Birth Defects Or Other Reproductive Harm. ), ( UPC: 019495495574 )

Review DORMAN/AUTOGRADE 1/4 1/8 Inch Hard Vacuum Tubing Connector

The **Dorman/Autograde 493-057 1/4" x 1/8" Vacuum Tubing Connector** is a precision-engineered, high-performance fitting designed to ensure reliable and leak-free connections within automotive vacuum systems. Crafted from durable, corrosion-resistant materials, this connector features a robust **1/4-inch male thread** on one end and a **1/8-inch female barb** on the other, allowing for versatile compatibility with a wide range of vacuum hoses, gauges, and components. Its **smooth, tapered barb design** ensures a secure, snug fit when paired with standard rubber or silicone vacuum tubing, minimizing the risk of slippage or air leaks that could compromise system efficiency. Ideal for applications in intake manifolds, brake boosters, EGR systems, and other vacuum-assisted components, this connector is built to withstand the demands of high-temperature environments and repeated mechanical stress, making it a dependable choice for both professional mechanics and DIY enthusiasts. The **clean, polished finish** not only enhances its aesthetic appeal but also reduces the likelihood of debris buildup, ensuring long-lasting performance. Whether used in performance modifications, restorations, or routine maintenance, this connector delivers the tight seal and durability required to maintain optimal vacuum system functionality.

The **Dorman/Autograde 493-057** is a 1/4" x 1/8" vacuum tubing connector, commonly used in automotive applications for brake, clutch, or vacuum-assisted systems. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros of the Dorman/Autograde 493-057 Connector**

1. **High Quality and Durability**

The Dorman brand is known for manufacturing reliable, high-quality automotive parts. This connector is typically made from durable materials like brass or stainless steel, ensuring longevity and resistance to corrosion. The Autograde line, in particular, is designed to meet or exceed OEM specifications, making it a trusted choice for aftermarket replacements.

2. **OEM Compatibility**

Dorman parts are engineered to match original equipment manufacturer (OEM) standards, ensuring a proper fit and function with most vehicles. This reduces the risk of leaks or performance issues that can arise from mismatched or inferior aftermarket parts.

3. **Wide Availability**

As a widely used part, the 493-057 connector is easy to find in most auto parts stores, both physical and online (e.g., Amazon, RockAuto, AutoZone). This makes it convenient for quick repairs or replacements without long wait times.

4. **Cost-Effective**

While not the absolute cheapest option on the market, the Dorman/Autograde connector offers a balance between affordability and quality. It is often priced competitively compared to premium brands, making it a budget-friendly yet reliable choice.

5. **Compatibility with Common Vacuum Systems**

- Brake booster vacuum lines

- Clutch master cylinder vacuum lines

- Engine vacuum ports (e.g., for PCV systems or performance modifications)

- Aftermarket vacuum pumps or boosters

6. **Easy Installation**

The design is straightforward, with a simple push-fit or threaded connection (depending on the application). Most users can install it without specialized tools, though a hose clamp or crimping tool may be needed for secure attachment.

7. **Good Customer Support and Warranty**

Dorman is backed by a reputable manufacturer (currently owned by ACDelco), which often provides warranties or return policies. This adds peace of mind in case of defects or installation issues.

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### **Cons of the Dorman/Autograde 493-057 Connector**

1. **Potential for Counterfeit or Low-Quality Units**

Like many popular Dorman parts, there is a risk of purchasing counterfeit or substandard replicas, especially from untrusted online sellers. Counterfeit connectors may fail prematurely, leak, or not fit properly. Always buy from authorized retailers (e.g., AutoZone, O Reilly Auto Parts, or reputable online stores) to avoid this issue.

2. **Material Variability**

While Dorman parts are generally high quality, some users report variability in material quality between batches. For example, brass connectors may tarnish or corrode over time if exposed to moisture or chemicals, though this is rare with proper installation. Stainless steel connectors are more resistant but may be slightly more expensive.

3. **Limited Customization**

This is a standard connector with fixed sizes (1/4" x 1/8"). If you need non-standard fittings (e.g., barbed, flared, or custom lengths), you may need to source additional adapters or purchase a different part entirely.

4. **Threaded vs. Push-Fit Confusion**

Some applications require threaded connections, while others use push-fit or clamp-style fittings. The 493-057 is typically a push-fit or clamp-style connector, which may not work with threaded ports on older vehicles or certain aftermarket components. Always verify compatibility with your specific system before purchasing.

5. **Potential for Leaks if Improperly Installed**

Vacuum systems rely on a tight seal to function correctly. If the connector is not securely clamped or if the hose is damaged, leaks can occur, leading to brake or clutch failure. Proper installation (e.g., using the correct hose clamp size) is critical.

6. **Price Sensitivity for Budget-Conscious Buyers**

While affordable compared to premium brands, some users may find the price slightly higher than generic or no-name alternatives. However, the trade-off in reliability often justifies the cost.

7. **Limited Longevity in Harsh Environments**

In extreme conditions (e.g., high heat, constant exposure to brake fluid or oil), even high-quality connectors may degrade over time. Regular inspection and maintenance are recommended for long-term reliability.

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### **Conclusion**

The **Dorman/Autograde 493-057 1/4" x 1/8" vacuum tubing connector** is a solid choice for most automotive applications requiring a reliable, OEM-compatible vacuum fitting. Its strengths lie in its durability, ease of installation, and widespread availability, making it a go-to option for brake, clutch, and vacuum system repairs. However, potential drawbacks such as the risk of counterfeit parts, material variability, and the need for proper installation cannot be ignored.

For most DIYers and professional mechanics, the pros outweigh the cons, especially when purchasing from a trusted source. If you prioritize quality and compatibility over absolute cost savings, this connector is an excellent investment.

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### **Recommendation**

- **Buy from a reputable retailer** (e.g., AutoZone, O Reilly, RockAuto, or Amazon with verified seller ratings) to avoid counterfeit parts.

- **Verify compatibility** with your specific vehicle or system before purchasing. Check for threaded vs. push-fit requirements and ensure the sizes match your hoses.

- **Inspect the connector upon arrival** for signs of damage or poor quality (e.g., rust, loose threads, or misaligned fittings).

- **Install properly** using the correct hose clamps or tools to prevent leaks. Follow manufacturer guidelines for your vacuum system.

- **Consider alternatives** (e.g., **Hiflo, ACDelco, or local auto parts store brands**) if you find a similarly priced or higher-quality option with better reviews.

- **For high-performance or custom applications**, pair this connector with high-quality vacuum hoses (e.g., **Flex-A-Lite or Braidflex**) to ensure optimal performance.

**Final Verdict:** The Dorman/Autograde 493-057 is a **highly recommended** connector for most standard automotive vacuum applications, provided it is sourced responsibly and installed correctly. It strikes a balance between affordability and reliability, making it a top choice for both professionals and enthusiasts.

Details:

part #: 493057 prices

• $18.49-$31.92

specifications emissyste:

• brand: Dorman/autograde
• mpn: 493-057
• part type: Vacuum
• manufacturer warranty: 1 Year
• california prop 65 warning: This Product Contains Chemicals Known To The State Of California To Cause Cancer And Birth Defects Or Other Reproductive Harm.
• upc: 019495495574

payments emissyste:

• wallet: Apple-pay
• other
• credit card: Mastercard

offer emissyste:

• availability: In Stock
• sold: 0
• options: Ship-to-home
• quantity: 2
• started: March 15, 2026

seller emissyste:

• # reviews: 130400
• rating: 99.5%
• city: Colmar, Pennsylvania

returns emissyste:

• policy: Returns Accepted
• time: 30 Days
• paid by: Seller

general emissyste:

• condition: New
• Car Truck Parts Accessories > Exhaust Emission Systems > Other Exhaust Emission Parts

shipping emissyste:

• class: Economy, Standard, Expedited, One-day
• type: Fixed
• cost: $0.00
• transit: 3-6 Days
• service: Economy, Standard, Expedited, Overnight

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