Tom from SWISCO responded:
June 23, 2017
It's very hard to tell what you have based on these photos. We don't have any bubble seal with a flat bulb like that. Are you sure it's not just compressed from age? See our 58-053, could you possibly get this to work?
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Paul from SWISCO responded:
June 26, 2017
Well, the bulb of the 58-053 that Tom mentioned will compress. Have you given that a look yet? It may be your best option.
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