TSP Vacuum Devices for Leak Testing
- Simple to Operate:
The air ejector has no moving parts and no lubrication is necessary. After applying leak detection fluid along the seam, simply place the vacuum device over the area to be detected and open the air valve.
- Rugged Yet Lightweight:
Our shockproof Vacuum Devices are built with lightweight acrylic which can be heat formed for special applications. The tough rubber gasket is designed to provide a maximum seal.
- Fast, Safe Evacuation:
Air ejection on standard models is less than 30 seconds. Our ejector is explosion proof and uses no electricity. Your compressed air supply (40-90 psi) will ensure safe, economical operation.
Flat Bottom Vacuum Boxes:
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- Model: 10FB
- Flat Bottom box for testing butt welds on flat surfaces
- Operates using compressed air
- Outside Dimension: 10" x 7" x 15/8" (LxWxH)
- Viewing Area: 67/8" x 4" (LxW)
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- Model: 20FB
- Flat Bottom box for testing butt welds on flat surfaces
- Operates using compressed air
- Outside Dimensions: 20" x 7" x 15/8" (LxWxH)
- Viewing Area: 167/8" x 4" (LxW)
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- Model: 30FB
- Flat Bottom box for testing butt welds on flat surfaces
- Operates using compressed air
- Outside Dimensions: 30" x 7" x 15/8" (LxWxH)
- Viewing Area: 267/8" x 4" (LxW)
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Corner Vacuum Boxes
Lap Joint Vacuum Box:
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- Model: 30FBLJ
- Flat bottom box for testing lap joint welds of 3/8" plate on flat surfaces
- Operates using compressed air
- Vacuum pump configurations available
- Outside Dimensions: 30" x 7" x 15/8" (LxWxH)
- Viewing Area: 267/8" x 4" (LxW)
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Flexible Vacuum Box:

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- Model: 30FB Flex
- Flex box for testing welds on a radius
- The 30 FB Flex will function on a convex or concave radius
- The surface must be curved. The 30FB Flex will not function properly on a flat surface.
- Operates using compressed air
- Vacuum pump configurations available
- Outside Dimensions: 30 x 7" x 15/8" (LxWxH)
- Viewing Area: 267/8" x 4" (LxW)
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Vacuum Boxes Come Supplied with:
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- Vacuum Box with installed Venturi and dial indicator (All vacuum gauge dials read 0-30” Hg).
- 1/4" threaded nipple
- 1/4" F x F ball valve
- 1/4" F x M elbow (corner boxes only)
- 1/4" quick connect
- 2 oz SEAMTEST Leak Test concentrate sample (4 oz / 5 gallon of water)
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Each box is shipped with the hardware to immediately begin testing when connected to an air source. In stock for immediate delivery.
SEAMTEST leak testing fluid is a low cost fluid for testing tanks, cylinders and bulkheads at 5-10 lbs. of air pressure. It detects smaller leaks than found with other fluids and leaves no greasy or fatty acid residue.
To use, thoroughly mix 4 oz. of leak test concentrate with 5 gallons of water. Brush or pour on seams and watch for bubbles.
Orders less than $50.00 are subject to a $25.00 small order fee.
Certificates of Calibration (COC) are free of charge to those that request it. Please specify if you want a Certificate of Calibration (COC) in the comments section during checkout.