NASA NTRS · 19660000228
Expandable rubber plug seals openings for pressure testing
Abstract
Plug assembly seals openings in piping systems, vessels, and chambers for low pressure leak testing. The assembly, which consists of a rubber sealing plug and the mechanism for expanding it into a pressure-tight configuration, adequately seals irregular diameters without damage to mating surfaces.
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1966-05-01. Expandable rubber plug seals openings for pressure testing. https://ntrs.nasa.gov/citations/19660000228
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