AMH1K-RODRXT1 AQUA SHIELDTM Circulator for Outdoor installation. Installs on TANKLESS HEATER WITHOUT BUILT-IN PUMP FOR SINGLE PIPE INSTALLATION, USE WITH ON DEMAND- For up to 600 Ft. of total pipe length and tankless for all minimum flow rates. Stainless high speed circulator, flanged, 10 ft. line cord, with outdoor enclosure, for water, sprinkler, bug and freeze protection, anti-tampering locking device tab. Timer set to “On” only. AMK-ODR bypass valve kit installs under fixture, Includes AMK-WB ON DEMAND- Patent pending. – Meets CA Title 24 with On Demand Option. FK75S Stainless 3/4″ Flanges included.