Downhole Products' EXPAND-O-LIZER SUB is an inline centralizer sub for under-reamed applications and tight tolerance applications where annular clearance is less than 1-1/4”. These subs are designed and manufactured specifically to the client's requirements to ensure the best possible solution, minimizing surge and drag while maximizing standoff. on a case by case basis.


  • One piece machined sub, spring steel design
  • Fully rotatable
  • Radius blade edges - casing friendly, drag reducing shape
  • Bi-directional and inline design


  • Centralizer placement/T&D analysis available
  • Dedicated engineering support team
  • Product design to meet specific application requirements
  • New sizes designed and tested within two weeks
  • Sizes range from 2-7/8” through 20”

For specifications, application solutions, and EXPAND-O-LIZER SUB availability, please contact your local Downhole Products representative.