Thermo King Throttling Valve OEM O-Ring Seal 331221
Official OEM Thermo King parts catalog entry for the Thermo King O-ring, Throttling Valve 331221, verified by PEAK Thermo King and West Texas Thermo King Texas, Utah, Wyoming, Washington, Oregon, serving all of the USA.
Built for Performance: The Thermo King O-ring, Throttling Valve 331221 delivers OEM-grade sealing for Thermo King refrigeration system components. This precision sealing element ensures reliable refrigerant control at the throttling valve, supporting consistent temperature control and uptime across reefer trailers and transport refrigeration units.
Thermo King refrigeration system integrity depends on small parts that perform without compromise. The O-ring Throttling Valve 331221 maintains leak-free operation within the throttling valve assembly, preserving system efficiency and reducing the risk of refrigerant loss that impacts fuel-efficient cooling and overall fleet ROI.
Key Features & Customer Benefits
- OEM-verified sealing – Ensures a precise, leak-resistant interface at the throttling valve for consistent refrigeration cycle control.
- OEM-grade elastomer – Maintains elasticity and sealing properties across temperature ranges common to transport refrigeration.
- Direct Thermo King fit – Engineered for compatibility with Thermo King compressor throttling valves to simplify installation and minimize downtime.
- Supports temperature control – Protects accurate pressure drop at the throttling valve for reliable evaporator performance and cargo protection.
- Fleet uptime focus – Small part reliability reduces service frequency and supports predictable maintenance scheduling for fleets operating in West Texas and the Permian Basin.
Product Details
| Part Number | 331221 |
| Product Name | Thermo King O-ring, Throttling Valve 331221 |
| Material | OEM-grade elastomer (O-ring sealing element) |
| Approximate Outer Diameter | 9.3 cm |
| Approximate Weight | 0.05 kg |
| Compatibility | Thermo King compressor throttling valves on popular models, including Precedent series and multiple CF, D, SB, SLX, Sentry and X-series units |
Efficiency & Sustainability
This O-ring supports fuel-efficient cooling by maintaining correct refrigerant metering and minimizing leaks that reduce system efficiency. Integration into Thermo King units monitored by Smart Reefer SR-4 and compliant transport refrigeration systems preserves temperature control and helps fleets meet regional environmental priorities such as CARB Evergreen guidance when applicable.
Installation & Maintenance Tips
Use OEM installation practices: inspect sealing surfaces for damage, fit the O-ring without twisting, and use OEM clamps and correct torque settings for surrounding hardware. Inspect O-rings during scheduled maintenance intervals and replace whenever elastomer hardening, cuts, or deformation appear to preserve system reliability.
Real-World Applications
The Thermo King O-ring Throttling Valve 331221 applies across refrigerated trailers, refrigerated trucks, and transport refrigeration units where accurate throttling valve sealing is critical to evaporator performance and compressor protection. Fleet operators in Amarillo, Lubbock, Odessa, and throughout West Texas deploy this component to maintain cargo temperature stability and reduce unscheduled service events.
Available for installation and service in Amarillo, Lubbock, Odessa, and throughout West Texas.
View all Thermo King PartsBacked by Thermo King’s engineering and supported by certified technicians at West Texas Thermo King, this component delivers lasting performance and uptime assurance for fleet operations.
For product verification or service assistance, call (806) 376-5837.
For current warranty eligibility or OEM replacement coverage, contact West Texas Thermo King for warranty information or visit this contact page for confirmation.
Frequently Asked Questions
Q: Is this O-ring compatible with Thermo King Precedent units?
A: Yes. The O-ring is intended for throttling valve assemblies used on Precedent-series applications and other Thermo King models that use the OEM throttling valve design.
Q: How does replacing this O-ring affect fleet refrigeration reliability?
A: Replacing a worn or damaged O-ring restores proper throttling valve sealing, reduces refrigerant leakage, and supports consistent evaporator performance, improving overall fleet reliability and temperature control.
Q: Can this part be installed during regular service intervals?
A: Yes. Technicians perform O-ring inspection and replacement during scheduled maintenance to minimize downtime and ensure a secure throttling valve seal.
Related Resources
Ask about fleet-wide parts programs through West Texas Thermo King.
Produced by a certified Thermo King dealership, West Texas Thermo King | a Division of PEAK Industrial. Servicing fleets across Amarillo, Lubbock, and Odessa.
Official OEM Thermo King parts catalog entry for the Thermo King O-ring, Throttling Valve 331221, verified by PEAK Thermo King and West Texas Thermo King Texas, Utah, Wyoming, Washington, Oregon, serving all of the USA.
Built for Performance: The Thermo King O-ring, Throttling Valve 331221 delivers OEM-grade sealing for Thermo King refrigeration system components. This precision sealing element ensures reliable refrigerant control at the throttling valve, supporting consistent temperature control and uptime across reefer trailers and transport refrigeration units.
Thermo King refrigeration system integrity depends on small parts that perform without compromise. The O-ring Throttling Valve 331221 maintains leak-free operation within the throttling valve assembly, preserving system efficiency and reducing the risk of refrigerant loss that impacts fuel-efficient cooling and overall fleet ROI.
Key Features & Customer Benefits
- OEM-verified sealing – Ensures a precise, leak-resistant interface at the throttling valve for consistent refrigeration cycle control.
- OEM-grade elastomer – Maintains elasticity and sealing properties across temperature ranges common to transport refrigeration.
- Direct Thermo King fit – Engineered for compatibility with Thermo King compressor throttling valves to simplify installation and minimize downtime.
- Supports temperature control – Protects accurate pressure drop at the throttling valve for reliable evaporator performance and cargo protection.
- Fleet uptime focus – Small part reliability reduces service frequency and supports predictable maintenance scheduling for fleets operating in West Texas and the Permian Basin.
Product Details
| Part Number | 331221 |
| Product Name | Thermo King O-ring, Throttling Valve 331221 |
| Material | OEM-grade elastomer (O-ring sealing element) |
| Approximate Outer Diameter | 9.3 cm |
| Approximate Weight | 0.05 kg |
| Compatibility | Thermo King compressor throttling valves on popular models, including Precedent series and multiple CF, D, SB, SLX, Sentry and X-series units |
Efficiency & Sustainability
This O-ring supports fuel-efficient cooling by maintaining correct refrigerant metering and minimizing leaks that reduce system efficiency. Integration into Thermo King units monitored by Smart Reefer SR-4 and compliant transport refrigeration systems preserves temperature control and helps fleets meet regional environmental priorities such as CARB Evergreen guidance when applicable.
Installation & Maintenance Tips
Use OEM installation practices: inspect sealing surfaces for damage, fit the O-ring without twisting, and use OEM clamps and correct torque settings for surrounding hardware. Inspect O-rings during scheduled maintenance intervals and replace whenever elastomer hardening, cuts, or deformation appear to preserve system reliability.
Real-World Applications
The Thermo King O-ring Throttling Valve 331221 applies across refrigerated trailers, refrigerated trucks, and transport refrigeration units where accurate throttling valve sealing is critical to evaporator performance and compressor protection. Fleet operators in Amarillo, Lubbock, Odessa, and throughout West Texas deploy this component to maintain cargo temperature stability and reduce unscheduled service events.
Available for installation and service in Amarillo, Lubbock, Odessa, and throughout West Texas.
View all Thermo King PartsBacked by Thermo King’s engineering and supported by certified technicians at West Texas Thermo King, this component delivers lasting performance and uptime assurance for fleet operations.
For product verification or service assistance, call (806) 376-5837.
For current warranty eligibility or OEM replacement coverage, contact West Texas Thermo King for warranty information or visit this contact page for confirmation.
Frequently Asked Questions
Q: Is this O-ring compatible with Thermo King Precedent units?
A: Yes. The O-ring is intended for throttling valve assemblies used on Precedent-series applications and other Thermo King models that use the OEM throttling valve design.
Q: How does replacing this O-ring affect fleet refrigeration reliability?
A: Replacing a worn or damaged O-ring restores proper throttling valve sealing, reduces refrigerant leakage, and supports consistent evaporator performance, improving overall fleet reliability and temperature control.
Q: Can this part be installed during regular service intervals?
A: Yes. Technicians perform O-ring inspection and replacement during scheduled maintenance to minimize downtime and ensure a secure throttling valve seal.
Related Resources
Ask about fleet-wide parts programs through West Texas Thermo King.
Produced by a certified Thermo King dealership, West Texas Thermo King | a Division of PEAK Industrial. Servicing fleets across Amarillo, Lubbock, and Odessa.