just had confirmation from seaquest that on the current line of apeks 2nd stages both the adjustable and non-adjustable use the same air tube. This means that if you want the t20 first stage (no environmental seal, no swivel) with an adjustable 2nd stage all you need to do is buy the basic t20 1st and 2nd and then replace the adjusting plug (for adjusting cracking effort with tools but not on the fly) from the non-adjustable 2nd with the adjusting knob and oring (part #ap2029 retail $31.50 and #ap1409 retail .80) from the adjustable 2nd The old air tube part #ap2048 is used only in the zeagle/apeks balanced 2nd. Older zeagle/apeks non adjustable 2nd stages can only be made adjustable at ridiculous cost hope this helps Tony Phillips
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