1/4 NPT Port Cabin Air Height Leveling Control Valve Kit for Hadley Mack Volvo
Available to Order
Need help finding the right part? Talk with a parts expert today.
Parts Support Hours: Monday–Friday, 8:00 AM–5:00 PM CT
Live Chat: Available 24/7
I needed a forklift part and wasn’t sure which one fit. They asked for the model and serial number, got back to me quickly, and made sure I ordered the right one. Really helpful.
Randy W. — Verified customer
Product Overview
Key Features & Performance
- Standard 1/4" NPT female port threads for reliable air line sealing
- Internal valve mechanism responds quickly to height changes for immediate leveling
- Durable design withstands harsh under-cab environments and road debris
- Direct replacement for leveling valves on Hadley, Mack, and Volvo cabin air systems
- Maintains proper cab height to reduce driver fatigue and protect suspension components
Fitment & Compatibility
- Hadley cabin air suspension systems
- Mack truck models with cab air leveling
- Volvo truck models with cab air leveling
- Any system utilizing a 1/4" NPT port for height control valve mounting
Common Uses
- Replacing a faulty leveling valve on a tractor cabin air suspension
- Restoring automatic cab height adjustment on long-haul trucks
- Servicing air-ride systems on vocational trucks with cab leveling
- Replacing a leaking valve to restore proper cab air pressure control
Technical Specifications
- Port Size: 1/4" NPT
- Valve Type: Cabin Air Height Leveling Control Valve
- Compatible Brands: Hadley, Mack, Volvo
Frequently Asked Questions
Q: Is this valve a direct bolt-on replacement for the original Hadley valve? A: Yes, the valve is designed to replace Hadley and compatible leveling valves with a 1/4" NPT port; mounting bracket compatibility may vary by model.
Q: Does this kit include gaskets or mounting hardware? A: The kit typically includes the valve assembly only; reuse existing mounting hardware and gaskets unless they are damaged.
Product appearance and specifications may vary slightly by batch. Compatibility may vary by serial number. Verify fitment before purchase.