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Expansion tanks... o2 barrier?

CBRob
Member Posts: 283
Does a typical radiant heat system with glycol need a special expansion tank?
I see that extrol has the standard tank and then an RX tank for radiant heat system.
Is it a plastic bladder vs rubber?
I see that extrol has the standard tank and then an RX tank for radiant heat system.
Is it a plastic bladder vs rubber?
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