Doublewall Tall Collar

“Tall Collar” Split DoubleWall Monitored Tank Sump

The “MW” variant of the B-400 Series of DoubleWall Tank Sumps is a “Tall Collar” design similar to the 407-TG Series. It is meant to be installed directly to the tank by the tank manufacturer of your choice. The benefit of the Tall Collar sump is that you can begin piping as soon as the tank is back-filled, saving time and labor. Read more

This 2-piece sump features a high-neck round reducer at the top and is Octagonal (8-sided) all the way to the tank. Available in 54″, 48″ and 42″ diameters with 36″ or 32″ reducers, it has a single joint that requires lamination inside and out. 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 complete lamination kit, combination pressure/vacuum gauge, monitoring tubing, liquid reservoir, monitoring fluid (propylene glycol) and all the tools and supplies needed to complete the installation to the tank. 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)
"Tall Collar" mount
Less labor and time
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 compliance(i)
  • Sump Interstice continuously tested (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
  • Mounts to Tank-manufacturer-installed Tall-Collar
  • Height is adjustable in the field
  • lamination required for center joint
  • Kitted: Includes installation accessories (i)
  • Interstitial fluid included (i)
  • Third Party Approved
  • UL Listed
  • 30 Year Warranty (i)