Closing Bolt for Old Style Halcyon P Valve
thingiverse
This is a replacement closing bolt for the old style Halcyon P valve - as I found out the hard way the original copper bolt will unscrew and fall out during a dive if it isn't screwed in tight. This version has an improvement over the original bolt: There is a recessed groove for the O-ring in the head, resulting in less protrusion when screwed in. The original O-ring seems to be a non-standard size, the closest match that I could find is a metric R6A (ID 8mm, dia 2mm).
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