what Mike said Larry, these old systems were designed to be "filled" to a level below the neck when at operating temperature, filled cold it should be at least 2-3" below the neck
"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir "When we tug a single thing on an old truck, we find it falls off" ~ me Some TF series details & TF heater pics
