Coolant Reservoir Cap / Surge Tank Fill Cap – 572.2044 or 05-0532312000

A small component with a critical job.

The rTech Black Label RT2044 Coolant Reservoir Pressure Cap is a heavy-duty replacement designed for compatible commercial truck cooling systems.

Rated at 20 PSI, the RT2044 is designed to provide the correct pressure-cap function when installed in a compatible cooling system.

A properly functioning pressure cap is an important part of cooling-system operation. A worn, damaged, or incorrect cap can contribute to coolant loss and cooling-system problems.

Built for demanding fleet service, the RT2044 provides a straightforward replacement for compatible coolant reservoir applications.

Built for uptime. Built for serious trucks.

Features & Benefits

• 20 PSI pressure rating
• Heavy-duty coolant reservoir pressure cap
• M50 × 2.5 threaded configuration
• Designed to help maintain cooling-system pressure
• Helps maintain a secure reservoir seal
• Durable construction for commercial vehicle environments
• Straightforward threaded installation
• Designed as an aftermarket replacement for compatible applications
• Fleet-approved Black Label quality

rTech Product Specifications

• rTech Part Number: RT2044
• Product Type: Coolant Reservoir Pressure Cap
• Pressure Rating: 20 PSI
• Thread: M50 × 2.5
• Outside Diameter: 2.437" / approx. 61.9 mm
• Inside Depth: 1.375" / approx. 34.9 mm
• Height: 1.437" / approx. 36.5 mm
• Installation: Threaded
• Series: rTech Black Label

The dimensional family and 20-PSI specification are also independently catalogued for the 572.2044 / 05-32312-000 interchange. 

Vehicle Applications

Designed as an aftermarket replacement for select Freightliner cooling-system applications, including certain Cascadia P4 reservoir-side configurations.

Pressure rating is application-specific. Never substitute a cooling-system pressure cap solely because the threads appear to fit. Verify fitment and required pressure rating before installation.

Direct Cross References

• rTech Black Label: RT2044
• Automann: 572.2044
• Automann: 5722044
• Freightliner: 05-32312-000
• Freightliner: 0532312000 

Cross-reference numbers and manufacturer names are provided for identification and fitment purposes only. All trademarks are the property of their respective owners. rTech Black Label products are independent aftermarket replacement parts and are not manufactured, sponsored, endorsed, or approved by the referenced manufacturers. Always verify fitment before installation.

Why the Correct Pressure Cap Matters

The cooling system is designed to operate within a specific pressure range.

The reservoir pressure cap forms part of that system and should be matched to the correct application.

An incorrect, worn, or damaged pressure cap can contribute to:

• Coolant loss
• Improper cooling-system pressure
• Leakage at the reservoir
• Cooling-system service problems 

Using the correct pressure-rated cap is particularly important because a cap that physically threads onto a reservoir is not necessarily the correct cap for that cooling system.

For commercial fleets, correct fitment matters.