The gearmotor and the bucket are coupled with a custom made coupling,1/2"-13 NC on one end and 1/2"-20 NF on other end, to accommodate the arbor adapter on the motor and the accumulator's mounting bolt.
It is meant to be positioned with some incline, so that the water does not pour out. The bucket is supported by two steel casters.
Quality wise, it is way beyond what Harbor Freight has to offer. If made from new parts, it would cost hundreds of dollars, but it was made from used parts that I had anyway (and can reuse later).i