this OEM replacement offers the exact threading and flow rate needed to maintain the correct HVAC gas manifold pressure

When brazing the VAL8211

This item is the gas control valve assembly only

always verify the OD against your York technical data sheet to maintain original factory fan speeds

What causes this pressure switch to fail

Resideo L8124L1011 Relay L99H008 this OEM replacement offers theThe Resideo L8124L1011 is a professional grade Triple Aquastat Relay designed for immersion type control in forced hydronic heating systems. This horizontal mount controller integrates high limit protection with low limit and circulator control, making it a standard for maintaining boiler temperatures and managing domestic hot water service. It features SPST high limit and low limit switching with a fixed 10F high limit differential and an adjustable