I am not familiar with a two valve system, although I have heard they exist. Mine is 3 valve, one each for water heater in and out. Both closed for winterizing. The third opens the loop providing water to all faucets. Normally closed but open for winterizing.
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Jan and Rocky
Volunteers USFWS. 9,300 hrs each, 29 refuges. 04 Allegro 30DA, WH 8.1, Banks, 2012 Jeep Liberty , Brake Buddy Adv Select, 300watts Solar, "Philippians 4:11-13 KJV"
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