Water well tank- Minimum Pressure Release Valve

The minimum pressure release valve on my home water well tank is bad. I am having a lot of trouble finding the part to replace it in Houston Tx. I am looking for Part Number 191-809R which is just the Minimum Pressure Release Valve. It is screwed into the Johnson Controls Part Number F93B-1 Air Volume Control. Does anyone know of a supplier in Houston where I can buy just the Minimum Pressure Release Valve? Can just the valve be replaced or will I have to replace the whole air volume control assembly?

Thanks in Advance,
Keith R.

Contact Preferred Pumps in Houston http://www.preferredpump.com/houston.html. I'm sure they can assist you.

And replace the whole AVC. The float is probably broken off in the tank anyway.

I doubt preferred would deal with the general public. If anything, try Gulf South Supply on Airline drive. And replace the whole float, the F93B. It's an air release, not a pressure release.