The Isolator Valve Kit is highly recommended when installing a tankless unit. If the heater needs maintenance of any kind, it saves a lot of time and money since the shut-off and service valves are both built-in (press. relief valve included).
PART # IK-WV-4-TH (threaded)
PART # IK-WV-4-SW (sweat)
MSRP: $99.98
PART # IK-WV-4-POC (push-on)
MSRP: $126.85