This model features a 1-1/8 inch ODF solder connection and a 9/16 inch port diameter

Always locate your pressure tap points on the top side of the refrigerant lines to prevent oil and sediment from accumulating in the bellows

The Allanson 421-557 is a heavy-duty oil burner ignition transformer engineered specifically for Arco and American Standard burners

it maintains factory-spec internal tolerances and port alignment

using the genuine Aprilaire 401 is essential for protecting the evaporator coil from debris buildup

Heil Quaker ICP 1177834 Gas Valve THPU32HP7Y This model features a 1-1/8The Heil Quaker ICP 1177834 Gas Valve is an essential OEM replacement component engineered for precision fuel regulation in residential and light commercial HVAC systems. This 24V gas valve is factory calibrated for natural gas applications with a set point of 2. 9 inches WC (Water Column), ensuring consistent burner performance and optimal combustion efficiency. Built with a 3 4 inch NPT inlet and outlet, it integrates seamlessly into standard gas