Rain Bird VB-JMB-6EXT-B jumbo valve box extension - 17.2 cm height - body only

Rain Bird VB-JMB-6EXT-B extension for jumbo valve boxes

The Rain Bird VB-JMB-6EXT-B is a rectangular extension designed for the Rain Bird Jumbo Series valve boxes. It provides additional installation depth when irrigation valves, manifolds and pipe connections are located further below ground level. With an actual overall height of 17.2 cm, this extension offers greater flexibility when installing automatic irrigation systems.

The black extension body is supplied without a lid. It is designed to complement compatible Rain Bird Jumbo valve boxes and is suitable for new irrigation projects as well as modifications to existing installations.

Additional installation depth for irrigation valves and manifolds

In larger irrigation systems, solenoid valves and manifold assemblies may be installed deeper than the height of a single valve box allows. This can be caused by deeper polyethylene pipework, extensive fittings or existing ground conditions.

The Rain Bird VB-JMB-6EXT-B provides a practical way to extend a compatible Jumbo valve box and adapt the installation to the required depth. This helps keep valves and pipe connections accessible for inspection, repairs and maintenance without excavating the entire installation.

Durable construction for underground use

The extension features a durable black plastic body with a rectangular design. It is intended for underground installation and use with compatible Rain Bird Jumbo valve boxes. Its specially designed upper and lower dimensions allow it to be integrated into the appropriate valve box system.

The extension is supplied without a lid and does not feature preformed pipe knockouts. It is therefore intended primarily for increasing the installation depth rather than replacing the main valve box body with its pipe openings.

Practical accessory for the Rain Bird Jumbo Series

The VB-JMB-6EXT-B offers a convenient solution for adapting an irrigation installation to local ground conditions. Maintaining accessible space around valves and manifold fittings is particularly important in larger irrigation systems.

During installation, ensure that the extension is correctly positioned and securely supported by the surrounding soil. Since no lid is included, additional compatible Rain Bird Jumbo Series components are required to complete a covered installation.

Technical specifications and dimensions

• Manufacturer: Rain Bird
• Model: VB-JMB-6EXT-B
• Manufacturer part number: A11445
• Product type: Rectangular valve box extension
• Compatibility: Rain Bird Jumbo Series valve boxes (VB-JMB)
• Version: Black extension body only, without lid
• Color: Black
• Bottom external dimensions: 62.1 x 45.5 cm (L x W)
• Bottom opening: 55.7 x 39.7 cm (L x W)
• Top external dimensions: 56.24 x 39.12 cm (L x W)
• Top opening: 50.4 x 33.9 cm (L x W)
• Overall height: 17.2 cm
• Nominal extension: 6 inches (approximately 15.2 cm)
• Pipe knockouts: No preformed pipe openings
• Application: Underground irrigation installations
• Package contents: 1 black extension body without lid

Frequently asked questions

What is the Rain Bird VB-JMB-6EXT-B used for?

The extension provides additional installation depth for compatible Rain Bird Jumbo valve boxes. It is particularly useful when irrigation valves and pipe connections are located deeper below ground level.

How tall is the jumbo valve box extension?

The actual overall height is 17.2 cm. The 6EXT model designation refers to a nominal 6-inch extension, equivalent to approximately 15.2 cm.

Is a green lid included?

No. The VB-JMB-6EXT-B is supplied as a black extension body only. A lid is not included.

Which valve boxes are compatible with this extension?

The extension is designed for Rain Bird VB-JMB Jumbo Series valve boxes. It is not intended for the smaller Standard Series or the larger Super Jumbo and Maxi Jumbo models.

Does the extension have preformed pipe knockouts?

No. The VB-JMB-6EXT-B does not have preformed pipe knockouts. Pipework should be routed through the designated openings in the main valve box body.