Direct Compatibility: Exact OEM 21L99 replacement for 21L9901

Engineered for reliability with HCFC and non-flammable HFC refrigerants

Built for rugged field use

the 233-46501-24 provides the reliable thermal-to-electrical conversion required for consistent pilot monitoring

Johnson Controls STT17A-617R Repair Kit THPU32HP7Y Direct Compatibility: Exact OEM 21L99The Johnson Controls STT17A 617R Seat Repair Kit is a critical maintenance component designed for the T 4000 series pneumatic thermostats and specific HVAC control valve assemblies. Engineered for precise pneumatic calibration, this kit addresses common failure points such as seat leakage and inconsistent air pressure regulation. Utilizing high grade elastomers and precision machined internal components, the STT17A 617R ensures optimal pneumatic