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Thermo King 1/4-Inch Brass Flare Service Port Cap 551983
Official OEM Thermo King parts catalog entry for the Thermo King 1/4-inch Brass Flare Cap (551983), 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 1/4-inch Brass Flare Cap (part number 551983) secures and seals open flared ports on Thermo King refrigeration systems, protecting transport refrigeration circuits and preserving temperature integrity across reefer trailers and refrigerated trucks.
Thermo King refrigeration system operators depend on this OEM brass flare cap to maintain leak-free connections during service, storage, and fleet rotations. West Texas Thermo King, a certified Thermo King dealership, lists this component as a standard service part for fleets operating in Amarillo, Lubbock, Odessa, and throughout the Permian Basin.
Key Features & Customer Benefits
OEM Brass Construction – Provides reliable corrosion resistance and long service life in transport refrigeration environments.
Precise Flare Fit – Mates with 1/4-inch SAE flare fittings to create a metal-to-metal seal that supports system integrity and reduces leak risk.
Fleet-Ready Compatibility – Fits standard Thermo King flared service ports used across Precedent, S-610, and Diesel Direct Electric platforms.
Simple Maintenance – Installs quickly with a 1/2-inch hex for secure wrench tightening, minimizing downtime during inspections or repairs.
Contamination Protection – Seals open ports to keep moisture and debris out of refrigerant circuits, supporting consistent temperature control and fuel-efficient cooling.
OEM Proven – Thermo King original part designed for dependable operation in commercial refrigerated transport.
Product Details
Part Number551983 (55-1983)Description1/4-inch Brass Flare CapTube / Fitting Size1/4 inch (SAE flare)Thread SpecificationStandard 7/16-20 UNF (for 1/4" flare fittings)Flare Angle45° (SAE)MaterialBrass (OEM specification)End ConnectionFemale flare cap for sealing male flare fittingsPrimary ApplicationTransport refrigeration, reefer trailers, refrigerated trucks
Efficiency & Sustainability
This OEM brass flare cap supports efficient, leak-free operation of Thermo King transport refrigeration systems, contributing to reduced refrigerant loss and improved system efficiency. Proper sealing helps maintain fuel-efficient cooling across Smart Reefer SR-4, Precedent S-610M, and Diesel Direct Electric platforms while aligning with responsible fleet maintenance practices and CARB Evergreen considerations where applicable.
Installation & Maintenance Tips
Use OEM flare fittings and hand-tighten before final wrench torque to avoid over-tightening the metal-to-metal seal. Inspect flare surfaces for burrs or debris and replace caps during scheduled service intervals to preserve system integrity and uptime.
Real-World Applications
The Thermo King 1/4-inch Brass Flare Cap (551983) seals unused service ports on reefer trailers, refrigerated straight trucks, and auxiliary refrigeration units during diagnostics, transit, or storage. Technicians use this cap to protect refrigerant circuits during component swaps, leak testing, and seasonal maintenance. Available for installation and service in Amarillo, Lubbock, Odessa, and throughout West Texas.
Backed by Thermo King’s engineering and supported by certified technicians at West Texas Thermo King, this component delivers lasting reliability 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 us for warranty information or visit the contact page to confirm coverage and terms.
Frequently Asked Questions
Q: Is this cap compatible with Thermo King Precedent units?
A: Yes. This 1/4-inch brass flare cap mates with standard Thermo King flared service ports used on Precedent-series and similar units for secure sealing.
Q: Can this cap remain installed during long-term storage?
A: Yes. The brass flare cap protects refrigerant circuits from contamination and helps retain system integrity during extended downtime.
Q: Is installation tool-intensive?
A: No. The cap installs with basic hand tools using the hex wrench flat for final tightening and supports quick service turnarounds.
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 1/4-inch Brass Flare Cap (551983), 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 1/4-inch Brass Flare Cap (part number 551983) secures and seals open flared ports on Thermo King refrigeration systems, protecting transport refrigeration circuits and preserving temperature integrity across reefer trailers and refrigerated trucks.
Thermo King refrigeration system operators depend on this OEM brass flare cap to maintain leak-free connections during service, storage, and fleet rotations. West Texas Thermo King, a certified Thermo King dealership, lists this component as a standard service part for fleets operating in Amarillo, Lubbock, Odessa, and throughout the Permian Basin.
Key Features & Customer Benefits
OEM Brass Construction – Provides reliable corrosion resistance and long service life in transport refrigeration environments.
Precise Flare Fit – Mates with 1/4-inch SAE flare fittings to create a metal-to-metal seal that supports system integrity and reduces leak risk.
Fleet-Ready Compatibility – Fits standard Thermo King flared service ports used across Precedent, S-610, and Diesel Direct Electric platforms.
Simple Maintenance – Installs quickly with a 1/2-inch hex for secure wrench tightening, minimizing downtime during inspections or repairs.
Contamination Protection – Seals open ports to keep moisture and debris out of refrigerant circuits, supporting consistent temperature control and fuel-efficient cooling.
OEM Proven – Thermo King original part designed for dependable operation in commercial refrigerated transport.
Product Details
Part Number551983 (55-1983)Description1/4-inch Brass Flare CapTube / Fitting Size1/4 inch (SAE flare)Thread SpecificationStandard 7/16-20 UNF (for 1/4" flare fittings)Flare Angle45° (SAE)MaterialBrass (OEM specification)End ConnectionFemale flare cap for sealing male flare fittingsPrimary ApplicationTransport refrigeration, reefer trailers, refrigerated trucks
Efficiency & Sustainability
This OEM brass flare cap supports efficient, leak-free operation of Thermo King transport refrigeration systems, contributing to reduced refrigerant loss and improved system efficiency. Proper sealing helps maintain fuel-efficient cooling across Smart Reefer SR-4, Precedent S-610M, and Diesel Direct Electric platforms while aligning with responsible fleet maintenance practices and CARB Evergreen considerations where applicable.
Installation & Maintenance Tips
Use OEM flare fittings and hand-tighten before final wrench torque to avoid over-tightening the metal-to-metal seal. Inspect flare surfaces for burrs or debris and replace caps during scheduled service intervals to preserve system integrity and uptime.
Real-World Applications
The Thermo King 1/4-inch Brass Flare Cap (551983) seals unused service ports on reefer trailers, refrigerated straight trucks, and auxiliary refrigeration units during diagnostics, transit, or storage. Technicians use this cap to protect refrigerant circuits during component swaps, leak testing, and seasonal maintenance. Available for installation and service in Amarillo, Lubbock, Odessa, and throughout West Texas.
Backed by Thermo King’s engineering and supported by certified technicians at West Texas Thermo King, this component delivers lasting reliability 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 us for warranty information or visit the contact page to confirm coverage and terms.
Frequently Asked Questions
Q: Is this cap compatible with Thermo King Precedent units?
A: Yes. This 1/4-inch brass flare cap mates with standard Thermo King flared service ports used on Precedent-series and similar units for secure sealing.
Q: Can this cap remain installed during long-term storage?
A: Yes. The brass flare cap protects refrigerant circuits from contamination and helps retain system integrity during extended downtime.
Q: Is installation tool-intensive?
A: No. The cap installs with basic hand tools using the hex wrench flat for final tightening and supports quick service turnarounds.
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.