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The RXSO Safety Relief Valve is recommended for use when noxious or expensive liquids or gases can possibly leak creating a need for superior seal quality. This valve has a special Teflon seat, making bubble-tight seals possible for over 90% of set pressures per spec API 527. Available in a Bronze body and sizes ranging from 1/2 to 2", RXSO safety relief valve is able to withstand pressures up to 400 PSIG and temperatures from -423 to +450°F.