does this work on the B750 model Chamberlain?

Yes, this would be the appropriate rail extension kit for your Chamberlain B750 opener.

Will this fit the chamberlain whisperer model 248739 ?

According to Chamberlain's web site, yes. Search for "chamberlain "248739"", you should find a downloadable parts manual; "8808CB 8 Foot (2.4 m) Rail extension kit" is listed for Models WD822KD • WD832KD • 248739, page 37.

I have a 12 x 16 foot door. Do I need to purchase an extension kit? If so, which one?

You will definitely need an extension kit. The opener is designed for a standard 7ft. door and therefore the rail (and belt on it) is only long enough to raise a door 7ft. I have an 8ft door and only bought the extension for the additional 1 ft. You should probably contact Chamberlain to see if they offer an extension for a 12ft door. It might require a different type of opener.

Do I need to purchase the extension kit for the garage door opener to work?

You have to purchase extension if door is 8 foot tall or it will not work.

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Group G8808CB-P Chamberlain 8808CB 8-Foot, Compatible Whisper Drive Plus Models, Includes Replacement Belt Garage Door Opener 8 Ft Rail Extension Kit

Product ID: 254614035

Details

Brand
CHAMBERLAIN
Colour
Black
Item weight
2.6 Pounds
Material
Alloy Steel
Style
Modern

📏8-foot steel rail extension

🔧Complete hardware & replacement belt kit

🛠️Enhanced structural integrity

114467CFA

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Description

🚪 Elevate your garage game with silent strength and seamless style!

BUILT TO LAST - Crafted from durable alloy steel to boost your garage door system’s strength and longevity.
EFFORTLESS DIY UPGRADE - Simple, user-friendly installation means you’re back in control faster—no professional needed.
WHISPER DRIVE COMPATIBLE - Designed specifically for Chamberlain Whisper Drive Plus models for perfect fit and performance.
SEAMLESS 8 FOOT EXTENSION - Upgrade your garage door opener with a robust 8-foot steel rail for smooth, reliable operation.
ALL IN ONE INSTALLATION KIT - Includes replacement belt and all necessary hardware—no extra trips to the store.

The Chamberlain G8808CB-P is an 8-foot structural steel rail extension kit designed for Whisper Drive Plus garage door openers. It includes a replacement belt and all necessary hardware, enhancing the durability and performance of garage doors up to 8 feet high. Engineered for easy installation and long-lasting reliability, this kit is a must-have upgrade for a quieter, stronger garage door experience.

Specifications

ASIN	B000VL9TBY
ASIN	B000VL9TBY
Batteries Included?	No
Batteries Required?	No
Color	Black
Customer Reviews	4.6 4.6 out of 5 stars (1,739)
Customer reviews	4.6 4.6 out of 5 stars (1,739)
Date First Available	6 August 2012
Date First Available	6 August 2012
Included components	Hardware, Manual, Rail Extension, Replacement Belt
Is Discontinued By Manufacturer	No
Item Package Quantity	1
Item Weight	1.18 Kilograms
Item model number	G8808CB-P
Item model number	G8808CB-P
Manufacturer	Chamberlain
Manufacturer	Chamberlain
Material	Alloy Steel
Part number	G8808CB-P
Product Dimensions	2.54 x 95.76 x 3.18 cm; 1.18 kg
Product Dimensions	2.54 x 95.76 x 3.18 cm; 1.18 kg
Size	8'
Specification met	not_applicable
Style	Modern

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114467CFA

Duties & taxes included

In stock

Sold byAmazon SenegalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Senegal.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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