AMH1K-7ODRXT1 AQUA SHIELDTM Circulator for Outdoor installation. Installs on TANKLESS HEATER WITHOUT BUILT-IN PUMP FOR SINGLE PIPE INSTALLATION, For up to 100 Ft. of total pipe length and tankless Flow requirement of .5 GPM or less, Stainless single speed circulator with union connections, 10 ft. line cord, with outdoor enclosure, 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- Meets CA Title 24 with On Demand Option. Patent pending. Union Kit UK75T 3/4″ threaded male fittings included.