I have a used S600 second stage and a used MK25 first stage with a Yoke from a MK20. I bought it that way. Last dove in Summer 2015 and worked great, but not serviced since and I would recommend servicing any used regulator. Price ($325) includes:
1st and second stage, shipping CONUS. If paying through PAYPAL, add 3%.
1st and second stage, shipping CONUS. If paying through PAYPAL, add 3%.
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