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  • Home
  • About Us
  • Internal Concrete Vibrators
    • Accessories
    • Parts by Vender
      • MasterⓇ Parts
      • MikasaⓇ Parts
      • NorthrockⓇ Parts
      • OztecⓇ Parts
      • StoneⓇ Parts
      • StowⓇ Parts
      • ViberⓇ Parts
      • WackerⓇ Parts
      • WycoⓇ Parts
  • Contact Us
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Happy Jack Logo Yellow Circle with black Outline Character Face Black Outline | Concrete Vibrator | HappyJack.com | Since 1992
Happy Jack sells internal concrete vibrator heads, shafts, power units, accessories, & parts from Northrock Industries Inc. Parts from Northrock Industries are made to be replacements for Master, Mikasa, Oztec, Stone, Stow, Viber, Wacker & Wyco products.

Get In Touch

We are located in Doylestown, PA.

  • Email: [email protected]
  • Phone: 1-800-886-4277

Parts By Vendor

  • MasterⓇ
  • MikasaⓇ
  • NorthrockⓇ
  • OztecⓇ
  • StoneⓇ
  • StowⓇ
  • ViberⓇ
  • WackerⓇ
  • WycoⓇ
  • MasterⓇ
  • MikasaⓇ
  • NorthrockⓇ
  • OztecⓇ
  • StoneⓇ
  • StowⓇ
  • ViberⓇ
  • WackerⓇ
  • WycoⓇ

Vibrator Parts

  • Accessories
  • Accessories

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*** Announcement: Jack has officially retired. Ownership transition coming soon. ***