The upper gasket was blown out on the thing. Luckily I had another monovalve with good gaskets, put them in and voila. I have no idea how long this will last but if it gets me to and from SF on my trip next week that suits me just fine.
Thanks

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'99 S420 - Mommies
'72 280SE 4.5 - looking to breathe life into it
'84 300SD Grey - Sold
'85 300SD Silver - Sold
'78 Ski Nautique