Armstrong Fluid Technology 571110LF-351 Valve 318172-701 it ensures the system achieves

it ensures the system achieves the necessary negative pressure to vent combustion gases safely before allowing the gas valve to energize

cracked ceramic inserts

eliminating the loud "clunk" often heard in residential ductwork

Will I need to modify the piping for this replacement

Superior Protection: The NEMA 4X rated coil prevents ingress from water and corrosion

Armstrong Fluid Technology 571110LF-351 Valve 318172-701 it ensures the system achievesThe Armstrong Fluid Technology 571110LF 351 is a high precision circuit balancing valve designed to optimize hydronic system performance in residential and commercial HVACR applications. As the direct replacement for 571110 351, this lead free valve (Model CBV075VSCR) features a robust brass body with EPDM elastomers to ensure long term durability and resistance to harsh environmental conditions. With a 3 4" SWT (solder joint) connection, it provides