This blue spring is rated for 5" to 8

Its precision-engineered solder cups facilitate consistent capillary action

Durable Construction: Engineered to withstand the thermal stress of frequent cycling in demanding HVAC environments

Its open construction and compact

including the G1FA048S21G series and specific G4FA air handlers

Bard HVAC 8403-089 Thermostat 319825-402 This blue spring is ratedThe Bard 8403 089 Thermostat is a field proven 1H 1C programmable thermostat built on the Honeywell T4 Pro Series platform. This unit serves as the direct replacement for Bard 8403 057 and Honeywell TH3110D1040, providing a seamless upgrade path for legacy single stage residential and light commercial HVAC systems. Designed for technical efficiency, it features a UWP mounting system and a tool less terminal block, significantly reducing installation