Corner Vacuum Boxes - These units are specifically designed for testing the inside corner, where the bottom meets the sidewall (at 90 degrees) of storage tanks. All vacuum boxes come packaged in a sturdy wood box to protect the unit during shipping and can be used to safely store your unit for future use. Each box is shipped with the hardware to immediately begin testing when connected to an air source. A 2oz sample of SEAMTEST is provided in the kit. In stock for immediate delivery. All vacuum gauge dials read 0-30” Hg.