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Ultraplugcollage 300X300ULTRAPLUG® hole plugs are designed to plug and seal unused holes in metallic, aluminum and nonmetallic enclosures. They fit a wide range of sizes – from ½” pilot light to 4” conduit trade sizes – so there is no need for restrictive hole-centering spacers. The self-centering, anti-rotational design ensures quick and simple one-person nut assembly and no tools are required for tightening and maintaining a NEMA 4X enclosure rating. Available in two colors.

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ULTRAPLUG® Series Features & Benefits 

  • Plug "fins": self-centering, anti-rotational design for fast & easy one-person plug assembly and no-tools tightening
  • Plug fits wide range of hole sizes without the use of restrictive hole centering spacers
  • Patented design: U.S. Pat No. 9,045,932
  • Recognized component for use with UL® & CSA® listed enclosure products
  • Molded material construction for a wide range of chemical compatible applications (polycarbonate with neoprene/EPDM gasket)ULTRAPLUG Light And Dark Gray Installed
  • Assembly designed to maintain applicable NEMA/UL/CSA enclosure ratings
  • Designed for use with wall thicknesses from 16 gauge through 1/4"
  • Designed for use with all metallic and nonmetallic enclosure materials
  • Low profile interior nut and exterior plug saves valuable panel space
  • Capable of sealing unused holes ranging in size from 1/2" to 4 3/4"


Get detailed information and specifications in the ULTRAPLUG Hole Plug product bulletin:

ULTRAPLUG Hole Plugs Product Bulletin 2015


Check out the latest video, showing just how easy it is to install a hole plug: