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Rain Bird VBJMB6EXTB Jumbo Valve Box Extension

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Free Shipping on Orders over $149
on sale $46.18
you save 37%

VB Series Valve Box BODY ONLY

When a project requires quality valve boxes, look no further than Rain Bird's VB Specification Series. Sure, the VB Series may be priced slightly more than a basic valve box, but they eliminate unnecessary expenses associated with a lesser quality product: lost or damaged lids, crushed valve boxes, or pest infestation, making the extra investment in the VB Series worth every penny!

Rain Bird's VB Specification Series valve boxes are loaded with industry leading features that build in strength and durability, prevent lawn equipment damage to the lids, and eliminate the possibility of dangerous pests from inhabiting the valve box.

Primary Application

Protects in-ground irrigation valves. Functions as a durable, rigid enclosure that provides easy access to valves for maintenance. Used in turf applications to house single valves or other subsurface components of an irrigation system.


  • Length: 24.4 inches (62,0 cm)
  • Width: 17.9 inches (45,5 cm)
  • Height: 6.75" (17.1 cm)

The standard VBJMB6EXTB Valve Box can comfortably fit up to 6 valves.

Features / Benefits

  • Easily removable knock-outs simplify pipe placement and reduce installation time. Four equally spaced knock-outs accommodate up to 2.0" diameter pipe.
  • Corrugated sides provide strength.
  • Lid snaps securely into place and can be removed by inserting a finger or screwdriver at access slots. (LID NOT INCLUDED)
  • Interlocking bottoms allow boxes to mate securely together bottom-to-bottom for deep installations.
Rain Bird
Size (in.):
Size (in.):
Valve Box Extension
Product Type:
Valve Box Extension
Average Rating:
5 Stars
5.0 / 5.0
1 Review
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1 Star
Right Part Right Price!
Exactly what we needed!! These guys had the part without the lids, which saved me money.
September 18, 2020
2 weeks ago
Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 9 questions Browse 9 questions and 10 answers
Why did you choose this?
SprinklerWarehouse.com Store
Needed a big high box to prevent water intrusion in low area
HOWARD M. on Nov 20, 2018
Valve depth required an extension
A L on Oct 9, 2018
Needed a big high box to prevent water intrusion in low area
HOWARD M. on Nov 20, 2018
size and price
B O on Oct 12, 2018
Valve depth required an extension
A L on Oct 9, 2018
To put 2 1/2 gallon EZ flo Tank in
ETCS on Jun 8, 2018
gain depth to prevent freezing
J O on Jul 22, 2017
size and price
B O on Oct 12, 2018
To put 2 1/2 gallon EZ flo Tank in
ETCS on Jun 8, 2018
can the Rain Bird VBJMB6EXTB Jumbo Valve Box Extension be used as a complete valve box; I am in a climate that never freezes, and do not need a deep box? Our pipes need only be 6" below the surface.
Walter D on Feb 20, 2017
BEST ANSWER: You could use it as a complete box, but one downside would be that it doesn't have the knock-outs that a regular box does. It would also be kind of a tight squeeze height-wise to fit a valve in the box, depending on how big of a valve you're using. One last thing to consider is that the extension doesn't come with a lid like a regular box, so it might not be worth it to buy a lid separately price-wise.
what lid do i need for a vbjmb6extb box ?
Robert P on Sep 18, 2017
BEST ANSWER: You may use the Rain Bird VBJMBL lid.

what are the inside dimensions? I need at least 24" at bottom.
A shopper on Jun 22, 2020
Do you have valve box extensions for 10" round?
Tom G on Jul 11, 2018
What’s the biggest size u have?
Also do u have it in 36x12
A shopper on Oct 27, 2017
Does your VBJMB6EXTB box have sloped sides? I want the top of the box measurements. Hopefully, they are 24.4" x 17.9" x 6.75". In other words, are the top and bottom measurements the same?
A shopper on Mar 11, 2017
I want to use the body only extensions to create a rectangular riser for my rectangular d-box that is about 5 - 6 feet in the ground. I just had my d-box dug up so that it could be cleaned out and now would like to create a riser for easy access in the future. I cannot find any rectangular risers and my d-box is too big for a round riser to fit around it. The d-box is 20 X 16. I would like to know the dimensions of your "body only" extenders you have on your website and am thinking of ordering some to stack on top of each other to create a riser for the d-box I have. Do you have ones that will fit?
Carolyn S on Oct 28, 2016
I was looking for a valve box that was 24in. tall. wondering if you can stack 2- 6 in. extensions? Actually using it for an access for domestic water from burried pipe to burried pipe in a conduit. and need access.
steve on Mar 18, 2016

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