Regulator Assembly, Upper, 431, 433, Includes gauge & fittings. The upper regulator is used only for bottle 2 (TFA in tboc chemistry). As this is an exchange part, you must return your old regulator complete with all parts. If you do not return your regulator or you return it missing parts, you will be charged for new regulator without exchange. If you do not want to send your old regulator back to us, you should purchase this same item as non exchange from us.
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