788L Light-Duty Lockdown Device- Can be added to any 788, 789 or 790 Series Torsion Spring. Designed to secure the arm in the down position during loading. It prevents the jetting action of the liquid from lifting the drop tube out of the tank. It locks in any of three down positions. Right-Handed Units (OPW Model 788L-0040), Left-Handed Units (OPW Model 788LH-0045).