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TRV control compatability

diygreystone Member Posts: 1
I'm changing out valves of an old water radiator system to TRV's. My plan is to install 1 1/4 Danfoss RA 2000 basically whenever I can find them cheap on eBay. How can I tell if valve controls are compatible with that valve body? Or are they all compatible? Trying to also source cheaper controls on eBay, but I'm having some difficulty figuring out if I need to be looking for certain specifications.