Starting the pan leak test. There's an inflatable bulb in the drain and the chain to that bulb is looped around the broom handle, just in case the bulb deflates and drops down into the drain. The ABS pipe the water is coming out of is just to keep water from spraying all over the place as the pan fills. The pan will be filled up to about an inch from the subfloor and the pan marked. If it doesn't leak, the water will remain at that mark during the 24 hour test. (It did.)