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The AO Smith 100109925 is a blocked inlet (K) switch used as an OEM replacement for AO Smith water heaters to detect restricted water flow and act as a safety inlet switch. It mounts via a plug-in mount, requires no batteries, and is intended for use in replacement or repair of blocked inlet/safety switch assemblies. The part is compact, approximately 1 x 1 x 1 inches, and fits multiple AO Smith models.
OEM blocked inlet safety switch for AO Smith water heaters; plug-in mount; replaces 193293 and 9004540215
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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