The Duro-Twist is a hand operated elevated regulator designed for use with square rod on both square and round externally insulated duct.
The Duro-Twist is engineered with a strong friction resistance so it stays set without any need to lock it in place. The high visibility yellow
handle allows it to be easily found in the field on wrapped duct. The handle position illustrates damper blade position on the outside of the
ductwork.