blinding : "isolement d'un appareil ou d'une section de tuyauterie ... par bride ou joint plein", according to Fabio Zubini's "Termes Pétroliers" technical dictionary.
So : "bride pleine" or "bride aveugle".

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Note added at 2003-05-13 13:33:38 (GMT) Post-grading
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Pardon me - but what the heck are you talking about ?

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Note added at 2003-05-13 13:42:35 (GMT) Post-grading
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(What I mean is - what are you talking about when you say you \"still have to combine this ... with the translation of \"grommet\" ? There is presumably a \"full\" ring (= anneau, rondelle) on whatever it is, \"full\" - i.e. blind - in the sense that it is not pierced.)