the Catch-All series core is specifically designed to handle the moisture-retention characteristics of Polyolester oils

it monitors blower motor performance to ensure the combustion air fan is generating sufficient static pressure before allowing the gas valve to energize

If you are using a standard immersion well

this genuine OEM replacement part ensures the control board receives the precise signal needed to maintain safe operation and prevent error codes like the common 3-flash sequence associated with pressure circuit failures

This specific part is optimized for the 121-12 and 243-12 series

GC Valve S401GF02V9BF5 Valve Els PW 17895 the Catch-All series core isThe GC Valve S401GF02V9BF5 is a high performance 2 way normally closed solenoid valve engineered for precision fluid control in demanding HVACR and industrial applications. Built with a rugged brass body and a 3 8" orifice, this valve ensures reliable flow regulation with a 1 4" NPT connection size. The integration of Viton seal material (FKM) provides superior chemical resistance and thermal stability, making it ideal for media that may degrade