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DIY Line Sets R-454B

MRCOOL® R-454B DIY line sets and couplers — pre-charged refrigerant line sets for extending or replacing the included line set on DIY 5th Gen, EasyPro, and DIY Select systems. Available in 16ft to 50ft in three size options. DIY Pro Cable versions include the communication wire needed for EZ Pro compatible systems.

Line Set Size Guide

Size Use With Lengths Available
1/4 x 3/8 6K, 9K, 12K indoor units 16ft, 25ft, 35ft, 50ft
1/4 x 1/2 18K indoor units 16ft, 25ft, 35ft, 50ft
3/8 x 5/8 24K and 36K indoor units 16ft, 25ft, 35ft, 50ft

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MRCOOL DIY Line Set Coupler Kit 24K 36K with 75ft DIY Pro Cable R-454B
$451.00 - $451.00
$451.00
$541.20
$541.20 - $541.20
$541.20

MRCOOL DIY Line Set Coupler Kit 24K 36K with 75ft DIY Pro Cable R-454B DIYCOUPLER-3858K75C

MRCOOL
In stock

DIY Line Set Coupler Kit for 24k and 36k line set - 75 ft DIYPro CableProduct DocumentationMRCOOL DIY Line Set Coupler Kit 24K 36K 75ft Installatio...

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$451.00 - $451.00
$451.00
$541.20
$541.20 - $541.20
$541.20
MRCOOL DIY Line Set Coupler Kit 9K 12K 18K with 75ft DIY Pro Cable R-454B
$427.00 - $427.00
$427.00
$512.40
$512.40 - $512.40
$512.40

MRCOOL DIY Line Set Coupler Kit 9K 12K 18K with 75ft DIY Pro Cable R-454B DIYCOUPLER-1412K75C

MRCOOL
In stock

DIY Line Set Coupler Kit for 9k, 12k and 18k line set - 75 ft DIYPro CableProduct DocumentationMRCOOL DIY Line Set Coupler Kit 9K 12K 18K 75ft Inst...

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$427.00 - $427.00
$427.00
$512.40
$512.40 - $512.40
$512.40
MRCOOL 50ft R-454B No-Vac Quick Connect Line Set NV50-3834-O
$722.00 - $722.00
$722.00
$722.00 - $722.00
$722.00

MRCOOL 50ft R-454B No-Vac Quick Connect Line Set NV50-3834-O

MRCOOL
In stock

The MRCOOL® 50ft R-454B No-Vac Line Set is a pre-charged, quick-connect line set designed for use with compatible R-454B mini-split systems. The No...

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$722.00 - $722.00
$722.00
$722.00 - $722.00
$722.00
MRCOOL 35ft R-454B No-Vac Quick Connect Line Set NV35-3834-O
$550.00 - $550.00
$550.00
$550.00 - $550.00
$550.00

MRCOOL 35ft R-454B No-Vac Quick Connect Line Set NV35-3834-O

MRCOOL
In stock

The MRCOOL® 35ft R-454B No-Vac Line Set is a pre-charged, quick-connect line set designed for use with compatible R-454B mini-split systems. The No...

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$550.00 - $550.00
$550.00
$550.00 - $550.00
$550.00
MRCOOL 25ft R-454B No-Vac Quick Connect Line Set NV25-3834-O
$440.00 - $440.00
$440.00
$440.00 - $440.00
$440.00

MRCOOL 25ft R-454B No-Vac Quick Connect Line Set NV25-3834-O

MRCOOL
In stock

The MRCOOL® 25ft R-454B No-Vac Line Set is a pre-charged, quick-connect line set designed for use with compatible R-454B mini-split systems. The No...

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$440.00 - $440.00
$440.00
$440.00 - $440.00
$440.00
MRCOOL 15ft R-454B No-Vac Quick Connect Line Set NV15-3834-O
$334.00 - $334.00
$334.00
$334.00 - $334.00
$334.00

MRCOOL 15ft R-454B No-Vac Quick Connect Line Set NV15-3834-O

MRCOOL
In stock

The MRCOOL® 15ft R-454B No-Vac Line Set is a pre-charged, quick-connect line set designed for use with compatible R-454B mini-split systems. The No...

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$334.00 - $334.00
$334.00
$334.00 - $334.00
$334.00
MRCOOL DIY Line Set Coupler Kit 3/8x5/8 24K-36K with 75ft Wire | DIYCOUPLER-3858K75
$225.98 - $225.98
$225.98
$225.98 - $225.98
$225.98

MRCOOL DIY Line Set Coupler Kit 24K/36K w/ 75ft Wire DIYCOUPLER-3858K75

MRCOOL
In stock

The MRCOOL DIY Coupler Kit (DIYCOUPLER-3858K75) extends a DIY lineset run with two coupler sets and 75ft of communication wire. For 24K and 36K sys...

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$225.98 - $225.98
$225.98
$225.98 - $225.98
$225.98
MRCOOL DIY 5th Gen 50ft 3/8x5/8 R-454B Line Set with DIYPro Cable for 24K-36K | DIY50-3858C-O
$761.98 - $761.98
$761.98
$761.98 - $761.98
$761.98

MRCOOL DIY 5th Gen 50ft 3/8 x 5/8 R-454B Lineset w/ DIY Pro Cable DIY50-3858C-O

MRCOOL
In stock

50ft 3/8" x 5/8" pre-charged R-454B lineset with DIY Pro Cable for DIY 5th Gen 24K & 36K indoor units. Length: 50 ft Liquid Line: 3/8" | Suctio...

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$761.98 - $761.98
$761.98
$761.98 - $761.98
$761.98
MRCOOL DIY 5th Gen 50ft 1/4x1/2 R-454B Line Set with DIYPro Cable for 9K-18K | DIY50-1412C-O
$688.98 - $688.98
$688.98
$688.98 - $688.98
$688.98

MRCOOL DIY 5th Gen 50ft 1/4 x 1/2 R-454B Lineset w/ DIY Pro Cable DIY50-1412C-O

MRCOOL
In stock

50ft 1/4" x 1/2" pre-charged R-454B lineset with DIY Pro Cable for DIY 5th Gen 18K indoor units. Length: 50 ft Liquid Line: 1/4" | Suction Line: 1/...

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$688.98 - $688.98
$688.98
$688.98 - $688.98
$688.98
MRCOOL DIY 5th Gen 50ft 1/4x3/8 R-454B Line Set with DIYPro Cable for 6K-12K | DIY50-1438C-O
$675.98 - $675.98
$675.98
$675.98 - $675.98
$675.98

MRCOOL DIY 5th Gen 50ft 1/4 x 3/8 R-454B Lineset w/ DIY Pro Cable DIY50-1438C-O

MRCOOL
In stock

50ft 1/4" x 3/8" pre-charged R-454B lineset with DIY Pro Cable for DIY 5th Gen 6K, 9K & 12K indoor units. Length: 50 ft Liquid Line: 1/4" | Suc...

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$675.98 - $675.98
$675.98
$675.98 - $675.98
$675.98
MRCOOL DIY 5th Gen 35ft 3/8x5/8 R-454B Line Set with DIYPro Cable for 24K-36K | DIY35-3858C-O
$649.98 - $649.98
$649.98
$649.98 - $649.98
$649.98

MRCOOL DIY 5th Gen 35ft 3/8 x 5/8 R-454B Lineset w/ DIY Pro Cable DIY35-3858C-O

MRCOOL
In stock

35ft 3/8" x 5/8" pre-charged R-454B lineset with DIY Pro Cable for DIY 5th Gen 24K & 36K indoor units. Length: 35 ft Liquid Line: 3/8" | Suctio...

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$649.98 - $649.98
$649.98
$649.98 - $649.98
$649.98
MRCOOL DIY 5th Gen 35ft 1/4x1/2 R-454B Line Set with DIYPro Cable for 9K-18K | DIY35-1412C-O
$586.98 - $586.98
$586.98
$586.98 - $586.98
$586.98

MRCOOL DIY 5th Gen 35ft 1/4 x 1/2 R-454B Lineset w/ DIY Pro Cable DIY35-1412C-O

MRCOOL
In stock

35ft 1/4" x 1/2" pre-charged R-454B lineset with DIY Pro Cable for DIY 5th Gen 18K indoor units. Length: 35 ft Liquid Line: 1/4" | Suction Line: 1/...

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$586.98 - $586.98
$586.98
$586.98 - $586.98
$586.98
MRCOOL DIY 5th Gen 35ft 1/4x3/8 R-454B Line Set with DIYPro Cable for 6K-12K | DIY35-1438C-O
$577.98 - $577.98
$577.98
$577.98 - $577.98
$577.98

MRCOOL DIY 5th Gen 35ft 1/4 x 3/8 R-454B Lineset w/ DIY Pro Cable DIY35-1438C-O

MRCOOL
In stock

35ft 1/4" x 3/8" pre-charged R-454B lineset with DIY Pro Cable for DIY 5th Gen 6K, 9K & 12K indoor units. Length: 35 ft Liquid Line: 1/4" | Suc...

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$577.98 - $577.98
$577.98
$577.98 - $577.98
$577.98
MRCOOL DIY 5th Gen 25ft 3/8x5/8 R-454B Line Set with DIYPro Cable for 24K-36K | DIY25-3858C-O
$704.98 - $704.98
$704.98
$704.98 - $704.98
$704.98

MRCOOL DIY 5th Gen 25ft 3/8 x 5/8 R-454B Lineset w/ DIY Pro Cable DIY25-3858C-O

MRCOOL
In stock

25ft 3/8" x 5/8" pre-charged R-454B lineset with DIY Pro Cable for DIY 5th Gen 24K & 36K indoor units. Compatible with EZ Pro systems. Length: ...

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$704.98 - $704.98
$704.98
$704.98 - $704.98
$704.98
MRCOOL DIY 5th Gen 25ft 3/8x5/8 R-454B Pre-Charged Line Set for 24K-36K | DIY25-3858-O
$525.98 - $525.98
$525.98
$525.98 - $525.98
$525.98

MRCOOL DIY 5th Gen 25ft 3/8 x 5/8 R-454B Lineset DIY25-3858-O

MRCOOL
In stock

25ft 3/8" x 5/8" pre-charged R-454B lineset for MRCOOL DIY 5th Gen 24K & 36K indoor units. Length: 25 ft Liquid Line: 3/8" | Suction Line: 5/8"...

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$525.98 - $525.98
$525.98
$525.98 - $525.98
$525.98
MRCOOL DIY 5th Gen 25ft 1/4x1/2 R-454B Line Set with DIYPro Cable for 9K-18K | DIY25-1412C-O
$501.98 - $501.98
$501.98
$501.98 - $501.98
$501.98

MRCOOL DIY 5th Gen 25ft 1/4 x 1/2 R-454B Lineset w/ DIY Pro Cable DIY25-1412C-O

MRCOOL
In stock

25ft 1/4" x 1/2" pre-charged R-454B lineset with DIY Pro Cable for DIY 5th Gen 18K indoor units. Compatible with EZ Pro systems. Length: 25 ft Liqu...

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$501.98 - $501.98
$501.98
$501.98 - $501.98
$501.98
MRCOOL DIY 5th Gen 25ft 1/4x1/2 R-454B Pre-Charged Line Set for 9K-18K | DIY25-1412-O
$312.98 - $312.98
$312.98
$312.98 - $312.98
$312.98

MRCOOL DIY 5th Gen 25ft 1/4 x 1/2 R-454B Lineset DIY25-1412-O

MRCOOL
In stock

25ft 1/4" x 1/2" pre-charged R-454B lineset for MRCOOL DIY 5th Gen 18K indoor units. Length: 25 ft Liquid Line: 1/4" | Suction Line: 1/2" Refrigera...

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$312.98 - $312.98
$312.98
$312.98 - $312.98
$312.98
MRCOOL DIY 5th Gen 25ft 1/4x3/8 R-454B Line Set with DIYPro Cable for 6K-12K | DIY25-1438C-O
$470.98 - $470.98
$470.98
$470.98 - $470.98
$470.98

MRCOOL DIY 5th Gen 25ft 1/4 x 3/8 R-454B Lineset w/ DIY Pro Cable DIY25-1438C-O

MRCOOL
In stock

25ft 1/4" x 3/8" pre-charged R-454B lineset with DIY Pro Cable for DIY 5th Gen 6K, 9K & 12K indoor units. Length: 25 ft Liquid Line: 1/4" | Suc...

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$470.98 - $470.98
$470.98
$470.98 - $470.98
$470.98
MRCOOL DIY 5th Gen 25ft 1/4x3/8 R-454B Pre-Charged Line Set for 6K-12K | DIY25-1438-O
$303.98 - $303.98
$303.98
$303.98 - $303.98
$303.98

MRCOOL DIY 5th Gen 25ft 1/4 x 3/8 R-454B Lineset DIY25-1438-O

MRCOOL
In stock

25ft 1/4" x 3/8" pre-charged R-454B lineset for MRCOOL DIY 5th Gen 6K, 9K & 12K indoor units. Length: 25 ft Liquid Line: 1/4" | Suction Line: 3...

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$303.98 - $303.98
$303.98
$303.98 - $303.98
$303.98
MRCOOL DIY 5th Gen 16ft 3/8x5/8 R-454B Pre-Charged Line Set for 24K-36K | DIY16-3858-O
$311.98 - $311.98
$311.98
$311.98 - $311.98
$311.98

MRCOOL DIY 5th Gen 16ft 3/8 x 5/8 R-454B Lineset DIY16-3858-O

MRCOOL
In stock

16ft 3/8" x 5/8" pre-charged R-454B lineset for MRCOOL DIY 5th Gen 24K & 36K indoor units. Length: 16 ft Liquid Line: 3/8" | Suction Line: 5/8"...

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$311.98 - $311.98
$311.98
$311.98 - $311.98
$311.98
MRCOOL DIY 5th Gen 16ft 1/4x1/2 R-454B Pre-Charged Line Set for 9K-18K | DIY16-1412-O
$274.98 - $274.98
$274.98
$274.98 - $274.98
$274.98

MRCOOL DIY 5th Gen 16ft 1/4 x 1/2 R-454B Lineset DIY16-1412-O

MRCOOL
In stock

16ft 1/4" x 1/2" pre-charged R-454B lineset for MRCOOL DIY 5th Gen 18K indoor units. No vacuum pump required. Length: 16 ft Liquid Line: 1/4" | Suc...

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$274.98 - $274.98
$274.98
$274.98 - $274.98
$274.98
MRCOOL DIY 5th Gen 16ft 1/4x3/8 R-454B Pre-Charged Line Set for 6K-12K | DIY16-1438-O
$261.98 - $261.98
$261.98
$261.98 - $261.98
$261.98

MRCOOL DIY 5th Gen 16ft 1/4 x 3/8 R-454B Lineset DIY16-1438-O

MRCOOL
In stock

16ft 1/4" x 3/8" pre-charged R-454B lineset for MRCOOL DIY 5th Gen 6K, 9K & 12K indoor units. No vacuum pump required — connect and go. Length:...

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$261.98 - $261.98
$261.98
$261.98 - $261.98
$261.98