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The type in which the drain discharge passage opens when not pressurized (after the exhaust of residual pressure) is called N.O. (normally open), and the type in which the drain discharge passage remains closed is called N.C. (normally closed). For details on usage, refer to “What are the differences in usage between the N.O. and N.C. float type auto drain options?” in the “FAQs-Frequently Asked Questions” section on the SMC website.