What the hell is TONVAL???
Without repeating all the stuff on the post about "Marine Brass?" the subject of TONVAL has not been addressed and perhaps should be. Many suppliers are selling skin fittings and valves in this material and the implication is that it is suitable for underwater use. My question is simply this.... Does ANYONE know what it is? I mean specifically? What is its chemical composition? Where does the term come from? Has anyone seen any test data on it or have any reason to believe it is suitable and will resist dezincification? Or are we all just accepting the publicity without question?
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