Where is the PMV cap you mentioned listed for sale? Could not find it. Above site you listed says "price not available for your country"? Thanks...They weren't forced to do it, they chose to do it n the cheap, rather than use the PMV designed by Coltri that simply replaces the cap of the filter tower.
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Pressure maintenance valve for portable compressors | Coltri Compressors
Product information Pressure maintenance valve for portable compressors. Use only with BC cylinder connections.coltri.com