Description
This vacuum check valve fits the Honda Acty Truck HA3, HA4 (1990-1999). Located along the vacuum hose system, it ensures one-way airflow and prevents backflow that can cause erratic engine behavior.
In Stock - ships from our California (USA) warehouse
Fast, reliable delivery - no overseas backorder wait.
Vehicle Fitment & Compatibility
Confirm your chassis code against the table below before ordering.
100% Fitment Guarantee
Not sure about fit? Add your chassis/VIN number at checkout and we confirm it before we ship. If a part does not fit your Acty, we exchange it or refund you in full.
Signs you need this vacuum check valve
- A vacuum circuit that will not hold
- Rough idle or emissions trouble
- A cracked or stuck check valve
Features & Function
- One-way vacuum control
- Correct valve for the Acty system
- Restores proper vacuum routing
Installation Specifications
- Difficulty: Easy.
- Estimated time: about 20 to 30 minutes.
- Required tools: Hose pliers and a rag.
Oiwa Garage Tech Note
"Blow through it both ways off the truck - it should pass one direction and seal the other. That quick test confirms the valve before you fit it."
Frequently Asked Questions
Which way does it install?
It is directional; match the flow arrow to the original routing. Check the listing photos to confirm the fitting sizes.
How do I test the vacuum check valve?
Blow through it both ways off the truck - it should pass one direction and seal the other. If it flows both ways or is blocked, replace it.
Fitment verified by the Kei truck specialists at Oiwa Garage · Listing updated June 2026.