The G 250 complies to the MK X B.A. except for the housing. The first variant had no venturi. The 2nd variant was named "G 250 Graphite" and introduced the venturi to increase breathing effort.
Later Scubapro sold special editions like the white one and the Crystal Clear (1997, looks extremly good but gets scratched even better). The last cry was the update on G 250 H.P. (got the valve system from G 500/ S 600). Now that the special valve from G 500/S 600 disappeared, the valve is nearly the same as in the beginning (except for some more sealings). This Type "G 250" can be found at many manufacturers - its became like a standard (Even an Apeks has quite the same configuration).
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