B-409 DW Transition

DoubleWall Monitored Transition/Piping Sump

The B-409-D-AB Series of DoubleWall Piping Sumps are also known as transition sumps and feature a single body with a closed DoubleWall bottom. This 1-piece sump features a high-neck round reducer at the top and is Octagonal (8-sided) all the way to the tank. Available in 56″, 48″ and 42″ diameters with 36″ or 32″ reducers, it has no joints to laminate. Read more

It ships under a continuous vacuum test of 20”+ Hg so you can be confident in the sump’s integrity before you start installing it. Natural colored clear walls allow for visual observation of the sump during all stages of installation and testing. Bravo DoubleWall sumps feature an 1/8″ interstice made with a 3D-woven fiberglass fabric which provides a compressive resistance of 1300 PSI. This means less fluid to fill and no “floating” walls. The interstice is filled with monitoring fluid via a Hydro-Vacuum filling procedure but can also be vacuum monitored without any special parts or tools. This sump is kitted to include a combination pressure/vacuum gauge, monitoring tubing, liquid reservoir, and monitoring fluid (propylene glycol). Sump covers are sold separately and one Bravo Vacuum Generator (Part # “VAC-KIT-D-AB”) is mandatory for each job site to complete the liquid fill.

DoubleWall Fiberglass (Monitored)
Monitored flat bottom
Shipped under a continuous vacuum test of 20+ Hg
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  • Made in the USA  (i)
  • FRP Construction / Built like a Tank (i)
  • Clear walls - True DoubleWall AB-2481 compliant performance (i)
  • Interstice continuously tested from factory to destination (i)
  • 8-sided walls for 45° and 90° piping
  • 56"ø, 48"ø or 42"ø diameter sump
  • 32”ø or 36”ø diameter reducer
  • Closed monitored bottom
  • Kitted: Includes installation accessories (i)
  • Interstitial fluid included (i)
  • Third Party Approved
  • UL Listed
  • 30 Year Warranty (i)