I have no idea abot the 40% rule, but Apex ststes in their manuals that their regulators can handle 40% O2 when they are new out of the box. Here in Sweden the legal limit for non O2 systems is 23% or 25%. Regards, Sten /Sten Meyer * Mogatan 1 * 426 76 V FROELUNDA * SWEDEN * m87stme@mt*.ch*.se* *
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