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What other TRV's are compatiable with Westherm 4's?

Does anyone know what other brand/model of TRV may be compatible with a Westherm 4? I want to replace the valve control heads without going to the trouble of draining the system to change the valve bodies.
Chris the DIYer, January 2011
probably none you don't think the manufacturer is going let you get away with that do you ?

brian, January 2011