They are usually T - handled wrenches with a one - way combination ratchet and clutch .
These are specialized torque wrenches used by plumbers to tighten the clamping bands on hubless soil pipe couplings .
plumbers are usually T - handled wrenches with a one - way combination ratchet and clutch .
These are specialized torque wrenches used by plumbers to tighten the clamping bands on hubless soil pipe couplings .