Manual gear operators shall be totally enclosed worm and gear
type, permanently lubricated. Manual operator components shall withstand,
without damage, a pull of 80 to 200 pounds on the handwheel, with
buried service gear units capable of withstanding input torque on
the operating nut as required by AWWA C504, and AWWA C507. Gear segment
shall be of ductile iron, ASTM A536, Grade 56-45-12 supported on bronze
bushings.