making it a reliable standard for veteran contractors handling liquid level verification

With 1/4-inch quick connect terminals and a 26VAC maximum rating

it maintains precise superheat control across varying load conditions

allowing for efficient field replacement and reduced downtime

reducing the need for multiple specialized modules

York S1-9951-1801 Orifice 320788-704 making it a reliable standardThe York S1 9951 1801 Orifice is a precision engineered fixed bore metering device designed for specific residential and light commercial HVAC applications. Featuring a . 180" orifice size (Sz15), this component is critical for maintaining accurate refrigerant flow control within the evaporator coil. As a genuine OEM replacement part, it ensures proper pressure drops across the liquid line, optimizing heat exchange efficiency in York, Coleman, and