MRCOOL 5th Gen DIY 16ft 3/8 x 5/8 Lineset for DIY 24K & 36K Indoor - R454B, DIY16-3858-O

Roll over image to zoom in Click on image to zoom

MRCOOL 5th Gen DIY 16ft 3/8 x 5/8 Lineset for DIY 24K & 36K Indoor - R454B, DIY16-3858-O

Name: MRCOOL 5th Gen DIY 16ft 3/8 x 5/8 Lineset for DIY 24K & 36K Indoor - R454B, DIY16-3858-O
Brand: MRCOOL
SKU: DIY16-3858-O
Price: 227.00 USD
Availability: InStock

★★★★★

Iron Line Verified

Authorized Dealer: MRCOOL

Official Partner

IN STOCK & RECEIVE IN 2-7 DAYS

SKU: DIY16-3858-O

Price:

$227.00

Quantity:

Financing as low as ~$3 / month (60 mo. terms) Estimate your payment

We pay your sales tax! (IL excluded) 📦 Order before 7 PM CST for same-day shipping.

Share this product

Section 179
Tax Savings

Save up to $47.67 on this equipment Estimate Your Tax Deduction

Calculate Savings →

Commercial Buyer?

Unlock volume pricing and dedicated facility support with Trade Accounts
(Requires minimum of 2+ items)

16 ft pre-charged lineset for 5th Gen DIY 24K and 36K systems
3/8" liquid line, 5/8" suction line
Snap-together Quick Connect fittings — no brazing, flaring, or vacuum pump needed
Pre-charged with eco-friendly R-454B refrigerant
UV-resistant insulation for outdoor durability

Order Placed

Ships Out

Delivered

*Please Note: This timeline is an estimate. Certain products may require an additional 1 week for manufacturing. Please speak with your sales rep, Matthew, for official details and confirmation before placing your order.

CALL US FOR THE MOST ACCURATE AND COMPETITIVE LTL SHIPPING RATE, (888) 308-5580

Get Questions Answered Fast

Experience: 20+ Years B2B • Origin: US-Based Support

EXPRESS SHIPPING

Most orders process in 1-3 days. Yes, even if it weights 400lb

Hassle-Free Returns

No restocking fees. Ever.

Manufacturer Warranty

Fully backed by the brands you trust.

Dedicated Rep Mathew

Speak to a US-Based Equipment Specialist: (888) 308-5580

Flexible Financing

Get Upto 60 Months Financing

Pre-Charged R454B • 100% DIY Installation • 16-Foot Reach

MRCOOL 5th Gen DIY 16ft 3/8" x 5/8" Lineset for DIY 24K & 36K Indoor Units

Streamline your short-run HVAC installation with the MRCOOL 5th Gen 16ft Pre-Charged Lineset (DIY16-3858-O). Specifically engineered for 24,000 and 36,000 BTU 5th Generation DIY mini-split systems, this 16-foot lineset is the perfect length for direct, back-to-back installations where the indoor air handler and outdoor condenser share the same wall. Factory-sealed and pre-charged with the latest low-GWP R454B refrigerant, this lineset completely eliminates the costly and time-consuming process of vacuuming, flaring, and charging. Utilizing MRCOOL's patented Quick Connect fittings, you can lock in a secure, leak-proof seal using nothing more than standard hand tools.

MRCOOL 5th Gen DIY 16ft 3/8" x 5/8" Lineset Applications

Back-to-back residential installations where the indoor and outdoor units are separated by a single wall.
Short-run system expansions for high-capacity 24K or 36K BTU units on ground-level floors.
Installations requiring a seamless, tool-free connection without the expense of hiring a licensed HVAC technician.
Eco-conscious upgrades requiring full compliance with the latest R454B refrigerant standards.

Engineered to provide the exact 3/8" liquid and 5/8" suction diameters required for optimal high-BTU refrigerant volume and efficient climate control in tight spaces.

MRCOOL 5th Gen DIY 16ft 3/8" x 5/8" Lineset Specifications

SKU	DIY16-3858-O
Length	16 Feet
Liquid Line Size	3/8 Inch
Suction Line Size	5/8 Inch
Compatibility	5th Gen DIY 24K & 36K BTU Indoor Handlers
Refrigerant Type	Pre-Charged with R454B
Connection Type	Quick Connect Patented Fittings

Why Choose the MRCOOL 5th Gen 16ft DIY Lineset

Zero Specialized Tools Required: The Quick Connect fittings create an airtight, leak-proof seal instantly.
Eco-Friendly & Future-Proof: Factory-charged with R454B, an environmentally conscious refrigerant that meets updated efficiency and environmental regulations.
Heavy-Duty Insulation: Robust outer insulation protects against condensation, energy loss, and harsh outdoor elements to ensure long-term reliability.
Massive Savings: Empowers you to completely bypass expensive professional vacuuming, flaring, and charging fees.

The MRCOOL 5th Gen 16ft DIY Lineset (DIY16-3858-O) provides the exact length and robust construction you need to securely connect your high-BTU system in close quarters, ensuring maximum efficiency and a true do-it-yourself installation experience.

Key Information

Order Cutoff Time: 2:00 PM EST
Order Handling Time: 1–3 business days (Monday–Friday)
Transit Time: 1–7 business days (Monday–Friday)
Total Estimated Delivery Time: 3–11 business days (Monday–Friday)
Shipping Availability: Free Shipping On some Items In The Contiguous United States only

For more information Click Here

Request Expert Consultation

Our tool specialists are ready to help you find the perfect solution for your specific application.

CAPITAL ACCESS

EQUIPMENT FINANCING

AVAILABLE

Preserve cash flow with up to 60 month financing.

Job Site Proven

Trusted by Facilities and manufacturing centers

JLT #180A-M2 Pneumatic Panel Flattener Customer review image

Travis Farwell | Farwell's Fine Woodworking Field Verified

I hope this helps

"I have attached the pictures of how I use my panel flattener. I hope this helps."

JLT #180A-M2 Pneumatic Panel Flattener

Mike Yaross Field Verified

Just what I needed

"Saw works great. Just what I needed. You may want to update the specs though. It says 110v but it’s 220v. I don’t think it will an 10” saw blade either. Haven’t tried but I don’t think it’s set up for one like it says. Ordering process was nice and easy. Thank you."

Castaly 12" Radial Arm Saw RS-612

FRANCISCO, Shop Manager Field Verified

Built for 24/7 Production

"Got the JLT #717C for our shop and it’s an absolute beast for narrow stile doors. The 2-second squaring cycle is legit—we’re easily pushing 100+ perfect doors a day now without stressing over glue joint alignment. Setup is super fast with the pin system, and the heavy-duty build takes daily abuse without losing accuracy."

JLT #717C Cabinet Door Clamp

JLT Pressurized A8 Glue Tank for PVA Glue PIZ.9001 in shop

Lincoln Lakes Ind | Lincoln Lakes Industries LLC Field Verified

Thanks for the service!

"Here are 2 pictures of the glue tank in our shop. I hesitated to send anything as it is not in its final place but perhaps it's good enough for you. We are using it for our drawer box station and assembly station. Thanks for the service!"

JLT Pressurized A8 Glue Tank for PVA Glue PIZ.9001

Gedalya Glauber Field Verified

Purchased Machine for Partner

"I purchased this machine for our partner in China to use. We had some issues but we were able to get them fixed thanks to iron line tools."

Virutex CE53S Edge Lipping Planer for Perfect Flush Edges 5300199

Virutex TWOO AB200 Corded Dowel Jointer (120V) 7900799 vertical dowel joint cutting on panel surface ensuring precise alignment and repeatable results

David & Joyce West Field Verified

I know this will meet my requirements

"haven't had a chance to use it but it looks like a well built product have a few projects down the road and I know this will meet my requirements. so hats off to your team! David"

Virutex TWOO AB200 Corded Dowel Jointer (120V) 7900799

Virutex AU93 Double Edge Trimmer And Scraper + RC21E Manual End Trimmer SET 2800086 complete edge finishing tool set shown with dual edge trimmer and manual end trimmer.

Stuart Casterlin | Stuart Casterlin Custom Cabinets and Fine Woodworking, Inc. Field Verified

Both Tools Work Great

"Both tools work great and are real time savers . The two tools that I received from your company were replacements for the exact same tools that I've used for the past years, I think its safe to say 20+ years. Extremely pleased with product and service."

Virutex AU93 Double Edge Trimmer And Scraper + RC21E Manual End Trimmer SET 2800086

Bradley Cole, CB Anderson Shutter Co Field Verified

They are just what we needed

"We use these clamps daily, and they're very helpful for our work. We are always happy to support a small business."

JLT #812B Clamp Design

California Air Tools 10020DCAD-22060 2.0 Hp Ultra Quiet Oil-Free 10 Gallon Air Compressor angled view with dual piston pump

Mike T., Shop Manager Field Verified

Quiet, Fast, and Totally Worth It

"Bought this California Air Tools compressor for the shop and it’s an absolute game changer. It’s incredibly quiet—you can actually have a normal conversation right next to it without yelling. It fills up fast, keeps up with all our nailers and blowguns with zero issues, and the oil-free pump means no maintenance. If you're tired of loud, annoying compressors ruining the vibe on your floor, grab this bad boy. Worth every penny."

Jet 16" x 40" Engine Lathe: Geared Head, 230 V 3 Phase, 3-1/8" Spindle Bore Dia, 25 to 1,800 RPM JT9-321381

Mark D. | Machine Shop Foreman Field Verified

Heavy Duty & Precise

"Brought this Jet 16" x 40" Engine Lathe into the shop recently and it’s an absolute beast. The 3-1/8" spindle bore is exactly what we needed for turning larger bar stock, and the geared head runs incredibly smooth from 25 all the way up to 1,800 RPM. It handles our heavy daily metalwork without breaking a sweat, and you can see how solid the build is right in the photo. If you need a reliable 3-phase lathe that holds tight tolerances all day, grab this bad boy. Worth every penny."

Jet Tools Lathe

Euroboor TCT 1" Depth Annular Cutter tungsten carbide tipped annular cutter designed for high-performance drilling in hard steel and abrasive materials.

LEKS KAMIHIRA Field Verified

Yep we got the cutter

"Yep we got the cutter. We haven’t used it, the project we purchased it for has ended. Shipping was fast and I had no issues getting my order"

Euroboor TCT 1" Depth Annular Cutter

Virutex Hand-Held Hot Air Edgebander Set AG52F AG98F AU93 RC21E 5200199 showing complete kit with edgebander, tape roll holder, and accessories

Jesse Pegorsch Field Verified

The edge bender is working great!

"The edge bender is working great! I’ll keep you in mind next time I need something for my shop"

Virutex Hand-Held Hot Air Edgebander Set AG52F: AG98F + AU93 + RC21E 5200199

Virutex Wheel Cutter Set of 2 Wheel Cutters for Laminate and Veneer 1527075 in retail packaging showing replacement cutting wheels

Bryce Bamsey Field Verified

Thanks for checking in.

"I believe they are working well judging by none of the guys have said anything about them other than a thank you for swapping them out for them hahah. So thanks for checking in."

Virutex Wheel Cutter Set Of 2 Wheel Cutters For Laminate And Veneer 1527075

Jesse Browning Field Verified

Figured it out

"I had issues initially with the order but iron line tools helped me figure it out and sent me another Handheld Gluer. Very good service."

Virutex EM125T Handheld Gluer With Upper Roller 2500300

Frequently Asked Questions

This MRCOOL 5th Gen lineset (DIY16-3858-O) is the 16-foot length, sized for back-to-back installs where the indoor air handler and outdoor condenser share the same wall. Longer runs call for a longer 5th Gen lineset in the same 3/8" x 5/8" size.

No. The DIY16-3858-O comes factory-sealed and pre-charged with R454B refrigerant, so cutting it would release the charge; choose the lineset length that best fits your run instead.

It is made for 5th Gen DIY 24K and 36K BTU indoor air handlers and uses a 3/8" liquid line and 5/8" suction line to match those higher-capacity systems.

No. The lineset is pre-charged and uses MRCOOL's patented Quick Connect fittings, which seal with standard hand tools, so no vacuuming, flaring, or charging is required.

It is factory-charged with R454B, a lower-GWP refrigerant that meets current environmental regulations for new systems.

Yes. It has heavy-duty outer insulation that helps prevent condensation and energy loss and protects the lines from outdoor weather.

What a privilege to help great companies #getworkdone:

OUTFITTING FACILITIES FROM COAST TO COAST

Iron Line Tools provides the critical equipment that industrial and manufacturing operations rely on to execute at the highest level.

Field Reports

MRCOOL 5th Gen DIY 16ft 3/8 x 5/8 Lineset for DIY 24K & 36K Indoor - R454B, DIY16-3858-O

Estimated Delivery Timeline