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Hi. I have two of the above in excellent condition. However, the associated valves are not and need to be replaced. In addition, I no longer need a 3 port system and want to convert to a 2-port system. Will a relevant Danfoss 2-port valve (or equivalent) be compatible with the HSA3? In other words, will the spindle on the 2-port mate with the drive recess of the HSA3? Thanks.