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Thanks for the reply. Correct...the presoak is its own separate line and is driven by the centrifugal pump. There is no solenoid. The air and presoak have separate lines that meet at a tee in the IBA. I also took the air line off the solenoid thinking that the check valve could be faulty...

I own an older Superwash facility with the old style touchless that has an arch. My issue is that we get soap purging at the end of the IBA wash cycle after the spot free pump (Cat 1010) shuts off. I have replaced the presoak and spot free check valves that are located in the bay. We have a...