AMH1K-7ODRXZT1 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, PUMP AM7-SU1LXZT1 Stainless Union Circulator with 3/4″ Male Tailpieces, with outdoor enclosure for water, sprinkler, bug, freeze protected, anti-tampering locking device tab, built-in timer, 10 Ft line cord, pump bypass connection, check, flow control, hose, Bypass Tee 3/4” FNPT x 3/4” MNPT x 3/8” OD Compression. AMK-ODR bypass valve kit: Bypass valve, hose, Tee. Valve on/off 95°-104°F Installs under-sink in COLD LINE, no power required under sink. Union Kit UK75T 3/4″ threaded male fittings included. Patented