Regulator, Chamber Pressure, 3900 & NW synthesizer. Exchange. This regulator is located inside the 3900 on the left side. It is a relieving regulator so it is constantly leaking a small amount of gas from a screw on the side. This small leak is normal. This regulator is used to set the chamber purge pressure. It is commonly used to make adjustment for running different columns from the original ABI columns. Since this is an exchange part, you must return your old part complete with all components. If you do not return your part or you return it missing components, you will be charged as though you purchased a new part without exchange. If you do not want to send your old part back to us, you should purchase this same item as non exchange from us.
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