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 71â„2"W x 21â„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.