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Chrome-bevel sheet on grid paper — specs and return notes filed under the bay.
Never cut the capillary
preventing the hunting or erratic firing common in poorly sensed streams
the HC21ZS123 is the designated direct replacement for HC21ZE123 and HC21ZE123A
It effectively translates ambient or fluid temperature changes into mechanical force
Built for durability and responsive control
Trane VAL3519 Gas Valve 321894-708 Never cut the capillaryThe Trane VAL3519 is an OEM 1 2" 24V Natural Gas Valve engineered for precise fuel regulation in residential and light commercial heating systems. As a veteran grade replacement part, this dual redundant solenoid valve ensures reliable ignition and consistent manifold pressure, effectively eliminating issues like delayed ignition or intermittent burner hangups. The unit features a standard 1 2 inch NPT inlet and outlet, designed for seamless