Looking on the Stein Dinse site, the 2 o-ring versions are listed for the later model 900ie. The earlier ones appear to have just one o-ring and appear to have been replaced by the later versions with the newer spigot included in the deal.
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Roast Beef Monster!
Termignoni and Bucci - Italian for pipe and slippers!
S4 Fogarty, S4R 07T, 748, Series 1 Mirage
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