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AO Smith Water Filter Installation Guide

AO Smith Under-Sink Filter InstallationThe AO Smith AO-US-200 3-stage under-sink filter uses a direct-connect design (no dedicated faucet, connects to existing cold faucet via diverter valve) for inst

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Updated Aug 2026 · AO Smith Water Filters

AO Smith Under-Sink Filter Installation

The AO Smith AO-US-200 3-stage under-sink filter uses a direct-connect design (no dedicated faucet, connects to existing cold faucet via diverter valve) for installation in 30--45 minutes. The AO Smith RO (AO-WH-F-RO) installs with a dedicated faucet following standard 5-stage RO under-sink installation (2--3 hours). AO Smith provides installation instructions and a customer support line. Lowe's offers installation services for in-store purchases through the Lowe's Pro Services network -- available in most US markets at $150--$300 for the RO system installation.