Radiator Specialty 60V No-Hub Torque Wrench No hub torque wrench is used for tightening band screws on rubber fittings Measures torque when it is turned in the clockwise, right hand direction and ratchets when turned counterclockwise When the band screw is correctly tightened, the wrench releases so that the handle can continue turning but the drive socket cannot Additional turning results only in additional clicking, but no additional tightening The proper way to test a ho-hub joint is by the pressure test