MASTERCOOL (91339 R12 and R134a O-Ring Assortment)

MASTERCOOL (91339 R12 and R134a O-Ring Assortment)

When it comes to automotive repairs and maintenance, having the right tools and accessories is crucial. One such essential item is the O-Ring, which plays a vital role in sealing connections and preventing leaks. If you’re in need of a reliable and versatile O-Ring assortment, look no further than the MASTERCOOL (91339 R12 and R134a O-Ring Assortment).

Why Choose the MASTERCOOL (91339 R12 and R134a O-Ring Assortment)?

1. Wide Compatibility: This O-Ring assortment is specifically designed for use with R12 and R134a refrigerants, making it suitable for a wide range of automotive applications. Whether you’re working on a car, truck, or SUV, these O-Rings will ensure a secure and leak-free connection.

2. High-Quality Materials: The O-Rings in this assortment are made from premium materials to ensure durability and longevity. They are resistant to various chemicals and can withstand high pressures and temperatures, making them ideal for automotive use.

3. Convenient Organization: The O-Rings are neatly organized in a sturdy and compact case, allowing for easy storage and transportation. The case is labeled with the sizes and types of O-Rings, making it effortless to find the right one for your needs.

What’s Included in the Assortment?

The MASTERCOOL (91339 R12 and R134a O-Ring Assortment) includes:

  1. 50 R12 O-Rings in various sizes
  2. 50 R134a O-Rings in various sizes
  3. 10 R12/R134a HNBR O-Rings
  4. 10 R12/R134a Green O-Rings

Frequently Asked Questions

1. Can these O-Rings be used for other refrigerants?

No, these O-Rings are specifically designed for R12 and R134a refrigerants. It is not recommended to use them with other refrigerants as they may not provide a proper seal.

2. Are these O-Rings compatible with all vehicle makes and models?

Yes, these O-Rings are compatible with most vehicle makes and models. However, it is always recommended to check the manufacturer’s specifications to ensure compatibility.


The MASTERCOOL (91339 R12 and R134a O-Ring Assortment) is a must-have for any automotive enthusiast or professional. With its wide compatibility, high-quality materials, and convenient organization, it provides everything you need to ensure leak-free connections in your automotive repairs and maintenance. Don’t compromise on the quality of your O-Rings – choose the MASTERCOOL (91339 R12 and R134a O-Ring Assortment) for reliable and long-lasting performance.

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