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Vacuum Test Plugs

Stemar multi-size vacuum test heads, manufactured by Vanderlans and Sons, are designed with a robust bladder on a light weight aluminum frame.



  • Field replaceable bladder give maximum expansion; covers the widest size range in the industry

  • The Super Wingnut™ makes adjusting the height of the unit quick and easy

  • All of our test heads come standard with a 1 ½” vacuum port, shut off valve, gauge measuring up to 30” of mercury, vacuum relief valve and a durable support bar.

  • Designed for use in the openings of manholes or other precast concrete structures.

Also known as: test heads, vacuum tester, bladder-max tester


Vacuum Test Plug Specifications

Low Pressure Safety Instructions

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