Air Conditioning Valve Core MC531 - 6-25-MC531
- Valve core for car air conditioner. Low pressure. 6mm.
AC Valve Core MC531 6mm
6 mm high-pressure valve core | R134a refrigerant | Seal included | Sold per piece
The MC531 valve core is a 6 mm high-pressure valve used in automotive air conditioning systems running on R134a refrigerant. Unlike the M10x0.75 core in Our range, which is labelled directly by its port thread size, MC531 is a trade designation for a specific core design — comparing both designations against the core originally fitted in the port is worth doing before ordering to avoid a mismatch.
What this valve core is for
The valve core fits into the AC system's service port and is what keeps refrigerant sealed inside the system between service visits. The 6 mm design suits high-pressure ports of that specific size, found on some automotive AC systems. The included seal closes off the connection and prevents the slow micro-leaks of refrigerant that are hard to spot by eye but gradually reduce cooling performance over time.
Design and construction
Accurate fit in the service port.
Supports correct installation in the port.
Prevents refrigerant micro-leaks.
Materials matched to this refrigerant.
Dimensions and technical data
| Parameter | Value |
|---|---|
| Product code | 6-25-MC531 |
| Designation | MC531 |
| Size | 6 mm |
| System side | High pressure |
| Refrigerant | R134a |
| Seal | Included |
| Application | Automotive air conditioning systems |
| Sold as | 1 piece |
Applications
- Workshops servicing and repairing automotive air conditioning
- Replacing a damaged or leaking valve core without disturbing the rest of the system
- AC systems running on R134a refrigerant
- Routine core replacement during AC system servicing
Frequently asked questions
How does the MC531 designation differ from the M10x0.75 core in Our range?
M10x0.75 describes the port thread size the core is built for directly, while MC531 is a trade designation for a specific 6 mm core design. Both are built for high-pressure ports on R134a systems, but they differ in size and how they're labelled — don't assume they're interchangeable without comparing against the core originally fitted in the port.
Does this core fit R1234yf systems?
Don't assume interchangeability without checking — valve cores are selected for a specific refrigerant, since the seal material has to hold up against contact with that refrigerant and the oil used in the system. This core is designed for R134a systems.
How do I check that the MC531 fits my service port?
The safest approach is comparing the dimensions and designation of the core originally fitted in the port against the MC531's specs before buying or installing it, or checking the technical documentation for that specific AC system.
Does installation need any special tools?
Yes, a proper valve core removal tool is needed to safely unscrew and install the core, and the whole procedure should be preceded by recovering the refrigerant with a recovery station.