GMV 5000 Valve
The 5000 Valve is no longer available from GMV, as it has not been made in over 15 years. OLS is no longer able to obtain replacement valves or parts for the 5000 single speed valve.
Unfortunately, GMV does not offer another single speed valve to replace the 5000 valve. All current model power units are supplied with the 2 speed GMV 3010 EN valve, which would require a new controller to accommodate the 2 speed valve function.
You may also be able to replace with another single speed valve like Blaine KV1P but it is not a direct replacement.