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MRCOOL 5th Gen 16ft 1/4 x 3/8 Pre-Charged Line Set for DIY 6K, 9K, & 12K Indoor

The MRCOOL 5th Gen 16ft 1/4 x 3/8 Pre-Charged Line Set is designed to make installation of MRCOOL DIY 6K, 9K, and 12K indoor units fast and hassle-free. Pre-charged with R-454B refrigerant, this Quick-Connection line set eliminates the need for vacuum pumps, gauges, or brazing equipment, making it simple for homeowners to connect their system. Built with durable copper and secure fittings, it ensures reliable refrigerant transfer and long-lasting performance.

Please note: This line set is designed for DIY installation and comes pre-charged with R-454B refrigerant for quick, tool-free setup.


MRCOOL 5th Gen 16ft 1/4 x 3/8 Pre-Charged Line Set for DIY 6K, 9K, & 12K Indoor Features

Pre-Charged with R-454B
Factory-charged with eco-friendly R-454B refrigerant, offering efficient performance with lower environmental impact.

Quick-Connection Fittings
Designed for a secure, leak-free connection that eliminates the need for vacuuming or specialized tools.

Durable Copper Tubing
Crafted from high-quality copper for reliable refrigerant flow and long-term durability.

Optimized Size
Features a 1/4" liquid line and 3/8" suction line, tailored for DIY 6K, 9K, and 12K indoor units.

Safety Compliant
Contains compressed gas and meets Proposition 65 safety requirements.


MRCOOL 5th Gen 16ft 1/4 x 3/8 Pre-Charged Line Set for DIY 6K, 9K, & 12K Indoor Applications

  • DIY installations – specifically designed for MRCOOL DIY 6K, 9K, and 12K indoor units.

  • System extensions – provides a pre-charged option for expanding coverage.

  • Upgrades – replace worn or damaged line sets with a fresh, ready-to-use solution.

  • Fast setup – Quick-Connection fittings reduce installation time and complexity.


What’s Included?

  • 16 ft 1/4 x 3/8 Pre-Charged Line Set (R-454B)

  • User Manual


Warranty

  • 1-Year Parts Warranty


MRCOOL 5th Gen 16ft 1/4 x 3/8 Pre-Charged Line Set for DIY 6K, 9K, & 12K Indoor Specifications

Specification Details
Equipment Type R-454B Charged Line Set
Length 16 Feet
Color Copper
Line Set Fitting Type Quick-Connection
Liquid Line Size 1/4"
Suction Line Size 3/8"
Contains Chemicals Yes
Contains Aerosol Yes
Contains Compressed Gas Yes
Proposition 65 Warning Yes
Restricted States GU, PR, VI

Frequently-Asked Questions

Is this line set DIY-friendly?
Yes. It is designed for DIY installation with MRCOOL DIY 6K, 9K, and 12K indoor units.

What refrigerant does it use?
This line set comes pre-charged with R-454B refrigerant, a more eco-friendly option than older R-410A refrigerant.

Do I need special tools for installation?
No. The Quick-Connection fittings allow for simple installation without vacuum pumps, gauges, or brazing.

Can I use this line set with other systems?
No. This line set is specifically engineered for MRCOOL DIY 6K, 9K, and 12K indoor units only.

Why Choose Green Vista Living


At Green Vista Living, we’re passionate about providing top-quality renewable energy and eco-friendly products that not only enhance your life but also help protect the planet. We’ve built our business with one mission in mind: to be the go-to destination for renewable energy solutions, outdoor gear, and off-grid supplies. When you shop with us, you’re not just getting innovative products—you’re joining a community that’s committed to sustainability.

We Put Our Customers First


As a small, dedicated team, we care deeply about your experience. Unlike large, faceless online companies, Green Vista Living offers a personal touch in everything we do. We're here for you from start to finish—whether you need product advice, support after a purchase, or just have questions. Our knowledgeable customer service team is always just a phone call or email away, ready to assist you in any way possible.

We Share Your Passion for the Planet


Our love for the outdoors and sustainable living runs deep. Most of our team hails from the mountains of Colorado, where renewable energy and the environment are part of daily life. So when you call Green Vista Living, you’ll speak directly with an expert who understands both the technical side of renewable products and the lifestyle they support. Whether you’re looking for solar generators, EV chargers, or any of our eco-friendly offerings, you can trust us to guide you with expertise and passion.

Trusted Industry Experts


Our close partnerships with the best brands in renewable energy and outdoor gear give us insider knowledge that you won’t find anywhere else. We’ve taken the time to carefully select products that stand out for their quality and reliability. At Green Vista Living, we believe in understanding our products inside and out so that we can help you make the right choice with confidence.

More Reasons to Love Green Vista Living


Price Match Guarantee: Thanks to our partnerships, we offer the best prices around. If you find a better deal, we’ll refund the difference.


Free Shipping: We offer free shipping on most orders to the lower 48 U.S. states, making your shopping experience even easier.


100% Secure Ordering: Our site uses SSL Encryption technology to keep your payment and personal information safe and secure.


Volume Discounts: For large orders, we’re happy to provide special pricing—just reach out for a custom quote.


Authorized Dealer: As an authorized dealer for all our brands, you’ll receive full manufacturer warranties with every order.


At Green Vista Living, we aim to make your renewable energy and outdoor experience as seamless and enjoyable as possible. With our unmatched customer service, expertise, and dedication to quality, you can shop with confidence, knowing you’re supporting a company that’s as committed to the planet as you are.

Frequently Asked Questions

Yes! We provide free and fast shipping on MOST orders within the continental United States. However, some specific brands and items will require a quote. You can live chat or call us for a quote
Most orders ship out within 1–2 business days and arrive within 3–5 business days depending on your location.
We offer easy returns as long as your item meets the conditions outlined in our Return Policy. Items must be unused, in original packaging, and returned within the specified return window.
Absolutely! Our in-house product experts are here to help. Live chat or call us 513-743-829 for personalized advice before or after your purchase.
Yes. All products include any applicable manufacturer warranties, and we’ll help you handle any warranty claims if needed.
Yes, we only sell 100% authentic, brand-new products, sourced directly from our manufacturers or authorized distributors.

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