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Ok, thanks for your help. I'll reconfigure it and see how it goes. Much appreciated

Thank you, so if I follow your explaination correctly is this configuration what you mean?

I put two different types of undersink vents on this line. Neither one allows the sinks to drain quickly. I was beginning to think I had a blockage somewhere down the line, until I unscrewed the vent. I filled the sink and it drained in seconds. This is the second undersink vent I installed and...