[MP-Squared]

I have a one piece Kohler pressure-assist toilet, model K3404 PB #20080, made on 8-6-91. The Kohler Pressure-Clean Flushometer Tank is a Model 81100.

Water is dripping from one of the bolts on the bottom that holds the pressure tank in place. It drips all the time and only stops when I shut off the water supply to the toilet.

I shut off the water supply, flushed the tank to relieve the pressure, removed the two plastic nuts on the bottom bolts, disconnected the water supply line at the pressure tank, pulled out the two clear small (5/8 inch?) plastic tubes that appear to feed into the bowl, and unhooked the trip lever.

Now, the pressure tank seems to be attached only to the 1.5 inch black hard rubber hose which feeds the flush water to the bowl. How do I detach this black hose from the bottom of the pressure tank? There is a plastic collar around the hose, just below the bottom of the porcelain tank. Does that unscrew? Will that release the pressure tank? I figure I must remove the pressure tank to see where the water is coming from.

Much appreciate any help here!