Not from what I understand Craig. The last thing I am looking at is this sightglass strainer then waiting for some super system cleaner to arrive to dose the crap out of it in case there is a strainer somewhere I cant find r the lines are clogged. Unfortunately I took the flow meters out of the circuit on the belief one had failed - otherwise I could check supply and return flows - may have to reinstall - pig of a dirty painful job.






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