Hopper automatically dumps when bumper release contacts side of dumpster. Hopper returns to an upright and locked position automatically after it dumps. Also includes a cable that may be operated from the seat of the fork truck to manually dump the hopper. A locking chain is provided to secure the hopper to the fork truck.

N.W:225kgs,

Usable fork pockets are 71⁄2"W x 21⁄2"H. Constructed with durable, consistent robotic welds. D-33, D-50, D-75 and D-100 are stackable if you stack the top hopper turned 90° from the bottom. Base fork pockets are 3/16" thick. Powder coat blue finish.

http://truckboxes.bossgoo.com/dumping-hopper/