I don't know of a source, but they're also used in paint mask
filter/respirators. Maybe a company like AO or MSA has them as
service/replacement parts.

WB
...........

"Richard J Kinch" wrote in message
. ..
Anyone know of a source for elastomer mushroom valves? These are the
little rubber discs with a stem used for one-way air flow (that is, a
check
valve), such as in inflatable raft fill valves, and scuba regulators
exhaust ports.




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