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Pioneer Copper Lineset — Full Kit for Mini Split Installation

Field-Tested Copper Linesets for Off-Grid Mini Split Installations

Full copper construction — Dehydrated soft drawn tubes resist rust and corrosion long-term
ASTM-B280 standard certified — Meets USA-Canada standards for refrigerant line safety and quality
Three-layer waterproof insulation — P.E. wrap blocks moisture and prevents temperature loss
Complete install kit — Includes signal cable, wall sleeve, putty, and drain hose
  • Free Shipping -- Ships free on all orders, no minimum

Price range: $79.95 through $408.95

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Pioneer® Copper Piping Kit Lineset for Mini Split Installation
Pioneer® Copper Piping Kit Lineset for Mini Split Installation
$79.95 – $408.95Price range: $79.95 through $408.95

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In the box

  • Insulated pre-flared copper refrigerant pipes
  • 16-gauge 4-lead communication wire
  • 10 ft condensate drain hose
  • Wall passage sleeve with cap and putty
  • Brass flare nuts
  • Non-adhesive wrapping tape
Pioneer® Copper Piping Kit Lineset for Mini Split Installation
Pioneer Copper Lineset — Full Kit for Mini Split Installation
$79.95 – $408.95Price range: $79.95 through $408.95

Field-Tested Copper Linesets for Off-Grid Mini Split Installations

Connect your indoor and outdoor mini split units with a copper piping kit built to handle real off-grid conditions. These field-tested linesets use dehydrated soft drawn copper tubes with three-layer waterproof P.E. insulation — weatherproof construction that holds up in remote cabins and grid-independent homesteads. Every kit includes pre-flared brass connections, a matching 16-gauge signal cable, a 10 ft. condensate drain hose, and a wall passage sleeve. ASTM-B280 compliant. Select your length and diameter based on your unit's BTU rating and get it installed right the first time.

FREE SHIPPING30-DAY RETURNSEXPERT SUPPORTFREE SHIPPING30-DAY RETURNSEXPERT SUPPORTFREE SHIPPING30-DAY RETURNSEXPERT SUPPORTFREE SHIPPING30-DAY RETURNSEXPERT SUPPORTFREE SHIPPING30-DAY RETURNSEXPERT SUPPORTFREE SHIPPING30-DAY RETURNSEXPERT SUPPORT
ASTM-B280 Compliant
3-Layer Waterproof Insulation
Pre-Flared Brass Connections
Signal Cable Included
10–50 Ft
Available Lengths
ASTM-B280
USA-Canada Standard
16 Gauge
4-Lead Signal Cable
Matched Diameter for Your Exact BTU Rating

Matched Diameter for Your Exact BTU Rating

The most common mini split installation failure is a mismatched lineset. Undersized copper pipes restrict refrigerant flow, and your unit never delivers its rated BTU output. This Pioneer lineset is built to ASTM-B280 standards with dehydrated soft drawn copper and pre-formed flare ends, so you get a sealed, reliable connection the first time. At Off Grid Vault, we carry components we would install on our own cabins — pre-vetted for compatibility so you do not have to cross-reference diameter tables and hope for the best. Select the correct size for your 9,000 through 24,000 BTU unit and install with confidence.

Install Once and Forget About It

Install Once and Forget About It

These dehydrated soft drawn copper tubes resist rust and corrosion far longer than mixed-alloy alternatives. Three-layer waterproof P.E. insulation wraps each line, blocking moisture intrusion that degrades lesser insulation over time. Brass flare nuts on pre-formed ends create a secure seal without field flaring — reducing installation errors and the refrigerant leaks that follow. For an off-grid setup where a service call means a long drive and a compromised system, this lineset delivers the kind of field-tested reliability that keeps your mini split running season after season without maintenance callbacks.

Every Component in One Box

Every Component in One Box

This kit includes more than copper. You get a matching-length 16-gauge 4-lead signal cable for communication between indoor and outdoor units, a 10 ft condensate drain hose, a wall passage sleeve with cap, wall filler putty, plastic dust caps to keep connections clean during installation, and non-adhesive wrapping tape. No separate trips to the hardware store for forgotten fittings. When you are setting up a mini split on a remote cabin or homestead, having every component in one box means fewer delays and a cleaner, faster installation from start to finish.

Compatibility Check

Confirm these three conditions before ordering to ensure a proper match with your mini split system.

  • Selected line length equals or exceeds the distance between your indoor and outdoor units
  • Diameter matches your BTU rating: 9K–12K BTU uses 1/4"-3/8", 18K BTU uses 1/4"-1/2", 24K+ BTU uses 3/8"-5/8"
  • Your mini split unit uses standard flare nut connections (not quick-connect fittings)

Built for Real Installations

Wherever you're running a mini split off the grid, these linesets deliver a clean, durable connection.

Remote Cabin HVAC
Homestead Heating & Cooling
Solar-Powered Mini Splits
DIY Mini Split Installations

Full specifications

At a glance

Surface
Dehydrated Soft Drawn Copper Tubes
Full specifications9 data points across 4 categories

Dimensions

Available Lengths10 Ft, 16 Ft, 25 Ft, 33 Ft, 50 Ft
Condensate Drain Hose10 ft.

Power & Performance

9,000 BTU - 12,000 BTU1/4"-3/8"
18,000 BTU1/4"-1/2"
24,000 BTU3/8"-5/8"

Materials

Pipe MaterialDehydrated Soft Drawn Copper Tubes
InsulationThree Layer Water Proof P.E. Insulation
FittingsBrass Flare Nuts, on ready formed flare ends

Compliance & Warranty

StandardCompliance with ASTM-B280 Standard (USA-Canada)

The Off Grid Vault Promise

Every product we carry earns its place on our shelf. If it doesn't meet our standards, it doesn't make the cut.

30-Day Performance GuaranteeIf it doesn't perform as specified, we make it right — uninstalled returns accepted within 30 days in original packaging.
Free ShippingShips free on every order. No minimums, no thresholds, no surprise freight charges at checkout.
Free System Design ConsultationOur engineers size your system for your actual consumption — no guesswork, no incompatible components.
★★★★★
“Bought the 25 ft kit for my 12,000 BTU Pioneer mini split going into my off-grid cabin. Pre-flared ends saved me from having to borrow a flaring tool, and the insulation quality is noticeably better than the generic lineset I used on my previous build. Having the signal wire and wall sleeve included meant one trip to the hardware store instead of three. Sealed up clean on the first try.”
F
First L.Prescott, AZ

Overview

 Connect your indoor and outdoor units securely with a copper piping kit lineset for mini split installation. Copper tube kits offer long-term durability that allows you to install them and forget about them as you enjoy the benefits of your new heating and cooling system.

Our kits come equipped with all the essentials for mini split piping, from nonadhesive wrapping tape to copper pre-flared refrigerant pipes that reduce the risks of rusting and future maintenance requirements. Shop Pioneer’s copper piping kit lineset for mini split installations and pair your heat pump with quality components that maximizes its performance.

Detailed Diameter Reference Guide Available Here

Diameter Selection Guide (FOR WYS-20 and WYS-22 SERIES) 

9,000 BTU Models (except for WYS009AMFI22RL) 1/4″-3/8″
12,000-18,000 BTU Models (as well as WYS009AMFI22RL) 1/4″-1/2″
24,000 BTU and Above Models 3/8″-5/8″

Diameter Selection Guide (FOR DIAMANTE/WYT-19 SERIES) 

9,000 BTU – 18,000 BTU 1/4″-3/8″
24,000 BTU 1/4″-1/2″
36,000 BTU  1/4″-5/8″

Diameter Selection Guide (FOR DIAMANTE ULTRA/WYT-22 SERIES) 

9,000 BTU – 12,000 BTU 1/4″-3/8″
18,000 BTU 1/4″-1/2″
24,000 BTU  1/4″-5/8″

Diameter Selection Guide (FOR HYPERFORMANCE WYF-25 SERIES) 

9,000 BTU – 12,000 BTU 1/4″-3/8″
18,000 BTU 1/4″-1/2″
24,000 BTU 3/8″-5/8″

Wrench/Tool Sizes Needed

The corresponding Wrench/Tool sizes needed to turn the flare nuts of the line-sets are as follows:

Line Diameter
Wrench Size
1/4″
5/8″
3/8″
13/16″
1/2″
15/16″
5/8″
1-1/16″
3/4″
1-5/16″

Pioneer’s copper tubing kits include:

  • Copper pipes
  • 3 layer insulation
  • Brass flare nuts
  • Includes the following:
    • Insulated pre-flared copper refrigerant pipes (length and diameter as chosen)
    • 4 lead communication wire between indoor and outdoor unit (same length as chosen)
    • 10 ft. condensate drain hose
    • Wall passage sleeve with cap and putty
    • Non-adhesive wrapping tape (2″ wide, 50′ length)

Feature Set

  • Highest Quality Full Copper Piping Kit Set. 
  • Compliance with ASTM-B280 Standard (USA-Canada).
  • Dehydrated Soft Drawn Copper Tubes.
  • Three Layer Water Proof P.E. Insulation.
  • Brass Flare Nuts, on ready formed flare ends.
  • Matching Length 16 Gauge 4 Lead Signal Cable set.
  • Plastic dust caps, to keep clean during installation.
  • Wall Sleeve/Liner with Cap.
  • Wall Filler Putty.
  • Non Adhesive Wrapping Tape.

Additional information

Diameter
Length

10 Ft, 16 Ft, 25 Ft, 33 Ft, 50 Ft

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Frequently Asked Questions

It depends on your BTU rating. For WYS-20 and WYS-22 series: 9,000 BTU models use 1/4-inch by 3/8-inch, 12,000 to 18,000 BTU models use 1/4-inch by 1/2-inch, and 24,000 BTU and above use 3/8-inch by 5/8-inch. Always verify your specific model number against Pioneer's diameter reference guide before ordering — an undersized lineset will restrict refrigerant flow and reduce your unit's cooling and heating output.
This is a full copper piping kit. The refrigerant lines are dehydrated soft drawn copper tubes — not copper-plated aluminum, not mixed alloy. Full copper construction resists rust and corrosion over the long term, which matters when your mini split is mounted on a cabin exterior exposed to humidity, temperature swings, and precipitation. The kit also complies with ASTM-B280 standards for USA and Canada, so you are getting material that meets established refrigerant piping requirements.
Yes. Every kit includes a matching-length 16-gauge 4-lead signal cable that runs between your indoor and outdoor units. It is the same length as the copper lineset you select, so you do not need to source a separate communication wire. The kit also includes a 10 ft condensate drain hose, wall passage sleeve with cap, wall filler putty, plastic dust caps, and non-adhesive wrapping tape — everything needed to complete the connection.
Off Grid Vault stocks components for people who are building real off-grid and grid-independent systems — not just picking up a random accessory. We carry this Pioneer lineset because it meets ASTM-B280 standards and uses full copper construction, which is what we would install on our own properties. If you have questions about diameter selection for your specific mini split model, you can reach us and get an answer from someone who understands off-grid HVAC, not a general-purpose customer service script.
Yes. Off Grid Vault offers a 30-day performance guarantee on uninstalled items in their original packaging. If you realize before installation that you ordered the wrong length or diameter, contact us and we will get it sorted. That said, double-check your BTU rating and measure your line run before ordering — it saves you time and ensures your mini split gets the correct lineset on the first attempt. We include the diameter reference guide for that reason.
The wrench sizes depend on your line diameter. For 1/4-inch lines, use a 5/8-inch wrench. For 3/8-inch lines, use a 13/16-inch wrench. For 1/2-inch lines, use a 15/16-inch wrench. For 5/8-inch lines, use a 1-1/16-inch wrench. For 3/4-inch lines, use a 1-5/16-inch wrench. Always use two wrenches — one to hold the connection and one to turn the flare nut — to avoid twisting the copper tube during tightening.
SKU: PKW-1/4-3/8-10 Category: Brand:

The Off Grid Vault Promise

Every product we carry earns its place on our shelf. If it doesn't meet our standards, it doesn't make the cut.

30-Day Performance Guarantee If it doesn't perform as specified, we make it right — uninstalled returns accepted within 30 days in original packaging.
Free Shipping Ships free on every order. No minimums, no thresholds, no surprise freight charges at checkout.
Free System Design Consultation Our engineers size your system for your actual consumption — no guesswork, no incompatible components.

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About pioneer HVAC Accessories

pioneer is a trusted manufacturer of premium hvac accessories. OffGridVault is an authorized dealer offering the full pioneer lineup with free delivery, price match guarantee, and expert support.

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