Model # 7708CB-P

Internet #206396802

Store SKU #293784

Chamberlain 8 ft. Chain Drive Extension Kit
0012381180011

Chamberlain

8 ft. Chain Drive Extension Kit

  • Fully open garage doors up to 8 ft. high
  • Quick-install rail system
  • Durable chain drive replacement belt
$4299 /each
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Frequently Bought Together

Product Overview

  • Fully open garage doors up to 8 ft. high
  • Quick-install rail system
  • Durable chain drive replacement belt
The Chain Drive Rail Extension Kit for 8 ft. High Garage Doors is required for reliable, everyday operation of Chamberlain chain drive models in 8 ft. garage door applications. Featuring a quick-install extension rail and replacement chain, the kit includes everything needed for quick and easy installation. Includes one-year warranty, rail extension, replacement chain, all necessary hardware and an instruction manual for easy setup.
  • Proven quality: rigorous quality testing ensures lasting performance
  • Product Dimensions: (D) 37.70 in. x (H) 1.00 in. x (W) 1.25 in.
  • Additional assurance with 1-year warranty
  • Chamberlain is the largest and most dependable garage door opener manufacturer in North America
  • The Chamberlain 8 ft. Chain-Drive Extension Kit is compatible with all Chamberlain chain drive garage door openers (except heavy duty chain drive models C205 and C455)

Product Overview

  • Fully open garage doors up to 8 ft. high
  • Quick-install rail system
  • Durable chain drive replacement belt
Model #: 7708CB-P
Sku #: 293784
Internet #: 206396802

The Chain Drive Rail Extension Kit for 8 ft. High Garage Doors is required for reliable, everyday operation of Chamberlain chain drive models in 8 ft. garage door applications. Featuring a quick-install extension rail and replacement chain, the kit includes everything needed for quick and easy installation. Includes one-year warranty, rail extension, replacement chain, all necessary hardware and an instruction manual for easy setup.

California residents: see   Proposition 65 information

  • Proven quality: rigorous quality testing ensures lasting performance
  • Product Dimensions: (D) 37.70 in. x (H) 1.00 in. x (W) 1.25 in.
  • Additional assurance with 1-year warranty
  • Chamberlain is the largest and most dependable garage door opener manufacturer in North America
  • The Chamberlain 8 ft. Chain-Drive Extension Kit is compatible with all Chamberlain chain drive garage door openers (except heavy duty chain drive models C205 and C455)

Info & Guides

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Name Tube Rail Chain Extension Kit 8 ft. Chain Drive Extension Kit 8 ft. Belt Drive Tube Rail Extension Kit 8 ft. Belt Drive Extension Kit Heavy Duty Chain Drive Rail Extension Kit for 8 ft. Garage Doors 12 ft. Rail Belt Drive Extension Kit 10 ft. Belt Drive Rail Extension Kit 10 ft. Chain Drive Rail Extension Kit Heavy Duty Chain Drive Rail Extension Kit for 10 ft. Garage Doors
Brand Genie Chamberlain Genie Chamberlain Chamberlain Ryobi Chamberlain Chamberlain Chamberlain
Ratings (9) (6) (108) (14) (9) (3) (52) (40) (3)
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Specifications

Dimensions

Maximum Garage Door Height (ft.)
8

Details

Garage Door Part/Accessory Type
Garage Door Opener Extension Kit
Returnable
90-Day

Warranty / Certifications

Manufacturer Warranty
1 Year

Specifications

Dimensions

Maximum Garage Door Height (ft.)
8

Details

Garage Door Part/Accessory Type
Garage Door Opener Extension Kit
Returnable
90-Day

Warranty / Certifications

Manufacturer Warranty
1 Year

Questions & Answers

I have a door with only 9 feet for rails and opener will the 8ft kit do the trick

Asked by: Neil
Hi Neil - The length of the extension is based on the height of the garage door. Our standard openers open a 7ft door. The installed length of our standard 7ft door with rail and motor head is between 123 to 128 inches. This 8ft extension allows you to fully open an 8ft garage door. The installed length of our rail and motor head with the 8ft extension is between 135 to 142 inches, depending on which garage door opener you are looking at.
Answered by: TheChamberlainTeam
Date published: 2016-05-04

Hi, I just installed a Clopay top of line insulated 14' wide x 8'-3" high (272 lbs) I am consider...

Hi, I just installed a Clopay top of line insulated 14' wide x 8'-3" high (272 lbs) I am considering the 3/4 HP Chamberlain opener. I need to be sure I get full opening of the door. What extension kit will do this? Is the kit's height adjustable to custom sizes such as 8'-3"? Thanks, Ed
Asked by: Ed
Hi Ed, the extension kit is adjustable and the one that will be needed for a 3/4 HP Chamberlain opener is part number 7708CB.
Answered by: TheChamberlainTeam
Date published: 2018-05-31

Where do I get the 10' kit?

Asked by: Don
Home Depot .com. http://www.homedepot.com/p/Chamberlain-10-ft-Chain-Drive-Rail-Extension-Kit-7710CB/202867899
Answered by: stingrayaxe
Date published: 2016-12-27

i HAVE 8' DOOR, MODEL HD 210 HAS 7' RAIL,CAN i GET 12" OF RAIL EXTENSION

i HAVE 8' DOOR, MODEL HD 210 HAS 7' RAIL,CAN i GET 12" OF RAIL EXTENSION
Asked by: SS
Yes you can get an extension kit. It is about 3 foot long since you eliminate an 2 foot piece of the original rail and add this 3 foot piece to give you the extra foot that you need. the Kit also comes with the longer chain/cable assembly that you will need.
Answered by: stingrayaxe
Date published: 2016-11-04
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Customer Reviews

8 ft. Chain Drive Extension Kit is rated 5.0 out of 5 by 6.
Rated 5 out of 5 by from Good product Works fine and was easy to install. Very happy with the Chamberland door opener
Date published: 2018-08-06
Rated 5 out of 5 by from Does what it's supposed to do. Swedged piece in photo is not included in kit. Does what it's supposed to do. Swedged piece in photo is not included in kit.
Date published: 2018-07-31
Rated 5 out of 5 by from Works As Advertised Unfortunately, if you have a garage door larger than seven (7) feet tall you will need a Chamberlain Extension Kit (eight (8) or ten (10) foot kit). The kit works as advertised and contains a longer belt drive and an extension rod. I feel the kit is overpriced especially considering I just purchased the top of the line Chamberlain Garage Door Opener but it works and I do love my new Chamberlain Garage Door Opener
Date published: 2017-12-29
Rated 5 out of 5 by from Easy to install, works perfectly. Easy to install, works perfectly.
Date published: 2017-01-03
Rated 5 out of 5 by from Excellent fit and easy to install. Instructions for installation were good. Excellent fit and easy to install. Instructions for installation were good.
Date published: 2016-11-08
Rated 5 out of 5 by from Great deal Worked great with sears opener and and a lot better price.
Date published: 2016-11-24
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