75 ft 1/4″ × 3/8″ Mini Split Line Set Installation Kit – Pre-Insulated HVAC Copper Tubing

Premium 75 ft 1/4″ × 3/8″ mini split line set engineered for reliable and efficient HVAC installations. This pre-insulated copper refrigerant line set is ideal for residential and commercial split air conditioners, heat pumps, and ductless systems.

H2: Complete Mini Split Line Set Installation Kit

This all-in-one installation kit includes everything needed for a clean, professional installation:

• 75 ft pre-insulated copper refrigerant lines – 1/4″ liquid + 3/8″ suction

• Pre-flared ends with flare nuts for fast, leak-proof connection

• High-density insulation to reduce heat transfer and condensation

• Protective packaging for secure transport

Designed for extended runs between indoor and outdoor HVAC units, this kit simplifies installation and improves system efficiency.

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H2: Technical Specifications – Engineered for Performance

H3: Premium HVAC Copper Refrigerant Tubing

• Line Size: 1/4″ (liquid) & 3/8″ (suction)

• Length: 75 ft (22.9 meters)

• Material: 99.9% pure seamless copper tubing

• Excellent heat transfer and corrosion resistance

Copper’s thermal conductivity and durability make it the ideal choice for HVAC refrigerant lines.

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H3: High-Quality Pre-Insulation Features

• Factory-applied closed-cell insulation

• UV and moisture-resistant outer jacket

• Reduces condensation and energy loss

• Improves cooling efficiency in hot and cold climates

The insulation supports consistent performance while protecting tubing from environment exposure.

Features of pipe insulation tubing:

● Pipe Insulation, Material Black Rubber, Temp Range -40 Degrees to 120 Degrees.

● The pipe insulation has a better function of moisture condensation. Insulation material is both the insulation layer and moisture-proof layer.

● There is no need to drop the water vapor permeation protective layer so that it has a better moisture condensation function.

Key Benefits of This Mini Split Line Set

Ideal for Residential & Commercial Installations

This line set is suitable for mini split air conditioners and heat pump systems in homes, apartments, offices, and light commercial spaces.

Faster Installation Saves Time & Labor

Pre-flared ends and included accessories significantly reduce on-site preparation time and labor costs.

Longer Runs for Flexibility

At 75 ft, this long line set supports extended refrigerant runs without compromising performance, giving installers greater flexibility in system placement.

Applications – Where This Line Set Is Used

Use this 75 ft mini split line set for:

• Residential ductless AC systems

• Heat pump installations

• Multi-zone mini split systems

• Light commercial HVAC projects

• Retrofit or replacement refrigerant lines

Perfect for HVAC professionals and experienced DIY installers alike.

HVAC Installation Best Practices

Follow these pro tips for the best results:

1. Accurately measure required line run before installation.

2. Verify insulation continuity to prevent thermal loss.

3. Properly torque flare nuts to prevent refrigerant leaks.

4. Ensure proper pitch on suction lines for moisture drainage.

Adhering to HVAC best practices helps ensure system efficiency and reliability.

Mini Split Line Set

Size	Length	Insulation Black Rubber	Flame Resistant
1/4+3/8	15m/20m/25m/30m/50m	8mm/9mm/10mm/13mm/19mm/25.4mm	M1/B1
1/4+1/2	15m/20m/25m/30m/50m	8mm/9mm/10mm/13mm/19mm/25.4mm	M1/B1
1/4+5/8	15m/20m/25m/30m/50m	8mm/9mm/10mm/13mm/19mm/25.4mm	M1/B1
3/8+5/8	15m/20m/25m/30m/50m	8mm/9mm/10mm/13mm/19mm/25.4mm	M1/B1
3/8+3/4	15m/20m/25m/30m/50m	8mm/9mm/10mm/13mm/19mm/25.4mm	M1/B1
1/2+3/4	15m/20m/25m/30m/50m	8mm/9mm/10mm/13mm/19mm/25.4mm	M1/B1
3/8+7/8	15m/20m/25m/30m/50m	8mm/9mm/10mm/13mm/19mm/25.4mm	M1/B1

1/4 + 3/8 Mini split line set used for 0.75TON - 1.0TON mini split air conditioner.

1/4 + 1/2 Insulated copper line set used for 1.5TON - 2.0TON mini split air conditioning.

1/4 + 5/8 Insulated copper piping used for 2.0TON - 2.5TON split air conditioner system.

3/8 + 5/8 Insulated copper tube apply for 3.0TON - 4.0TON ductless mini split air conditioner.

3/8 + 3/4 Insulated copper tubing used for 4.5TON - 6.0TON split air conditioner installation.

3/8 + 7/8 Insulated copper piping apply for 6.0TON - 8.0TON ductless mini split air conditioner.

Air conditioning copper line sets 1/4 + 3/8 used for 0.75P and 1P split air conditioning.

Copper pipe kit 1/4 + 1/2 commonly used for 1.5P and 2P mini split air conditioners.

1/4 + 5/8 Insulated copper line set used for 2P and 2.5air conditioner system.

3/8 + 5/8 Mini-split copper line set apply for 3P and 4P ductless mini split air conditioner.

3/8 + 3/4 Copper pipe kit used for 4.5P and 6P split aircon installation.

3/8 + 7/8 Insulated copper piping apply for 6P - 8p TON ductless mini split air conditioner.

1/4 + 3/8 Mini split line set used for 9000BTU and 12000 BTU split air conditioner.

All copper line set 1/4 + 1/2 commonly used for 12000 BTU and 18000 BTU mini split air conditioners.

1/4 + 5/8 Insulated copper line set used for 24000 BTU and 30000 BTU air conditioner system.

3/8 + 5/8 Mini-split line set apply for 36000 BTU and 48000 ductless air conditioner.

3/8 + 3/4 Mini split line set used for 54000 BTU and 72000 split air conditioner installation.

3/8 + 7/8 Insulated copper piping apply for 72000 BTU - 96000 BTU ductless mini split air conditioner.

Aircon copper line set 1/4 + 3/8 used for 9K and 12K split air conditioner.

High quality copper line set 1/4 + 1/2 commonly used for 12K and 18K mini split air conditioners.

1/4 + 5/8 Insulated copper line set used for 24K and 30K air conditioner system.

3/8 + 5/8 Mini-split line set apply for 36K and 48K ductless air conditioner.

3/8 + 3/4 Mini split line set used for 54K and 72K split air conditioner installation.

3/8 + 7/8 Insulated copper pipe apply for 72K - 96K ductless mini split air conditioner.

Why Choose 75 ft 1/4" x 3/8" Mini Split Line Set from DABUND PIPE

We are manufacturer of Mini split line set since 2008 years, have good experience of producing and exporting. We have cooperated 9 years forwarder, can guarantee the shipment. Every week we load at least 6-8 40HQ to different countries. Choose Dabund You will win the business.

Individual pre-insulated rolls to perfectly fit every ductless mini-splits, VRF, heat pumps and unitary systems installation.

Quality products with competitive pricing

Peace of mind with professional services

DABUND FACTORY

We produce Insulated Copper Pipe, Mini Split Line Set and Aluminum Pipe and HVAC Parts

SGS Certificate

Mini Split Line Set is made of Polypropylene or Black Rubber with UV Resistant, meets ASTM E 84, UL94, ASTM D1056 and ASTM G 21

Exhibition

We join the exhibitions all over the word, just to facilitate customers to experience our mini split line set face to face.

FAQ

1.Q:What is your payment terms?

A:TT,L/C AT SIGHT,CREDIT CARD etc

2.Q:What is your delivery terms?

A:EXW, FOB, CFR, CIF etc

3.Q:Are you trading company or manufacturer?

A:Manufacturer

4.Q:May I get a sample?

A:Yes, we can send you 3pieces free samples.

   You just charge for the express cost is ok.

5.Q:Can I print my logo?

A:Yes of cause, we accept OEM and ODM.

6.Q:How long is your delivery time?

A:Usually 15-20days, if urgent, we can arrange to do in advance and delivery fast.

7.Is this 75 ft line set compatible with all mini split brands?

Yes, this 1/4″ × 3/8″ line set is compatible with most mini split and ductless HVAC systems available in the US and international markets. Always check manufacturer specifications before installation.

8.Can this line set be shortened if needed?

Yes — the copper tubing can be cut to fit specific lengths, but proper flaring and sealing techniques must be applied to maintain system integrity.

9.Is additional insulation required?

No — the factory-applied insulation is designed to meet HVAC performance needs and does not require extra wrapping for normal installations.