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On a truck with two separate air supply circuits feeding one shared function, the Bendix Double Check Valve is what automatically selects air from whichever circuit holds higher pressure. The Bendix K022131 seats an internal shuttle that shifts toward whichever port loses pressure, blocking that side while the higher-pressure circuit takes over. That automatic selection keeps the shared function supplied even if one circuit's pressure drops, without needing the driver to manually switch sources. Automatic source selection keeps the shared air function available through a single-circuit pressure loss.
| Auxiliary Port | Not applicable to this part |
| Button(s) Included | Yes |
| Cautionary Note(s) | Not applicable to this part |
| Delivery 21 Port | 3/8 PTC (90Adeg Elbow / Composite / Black Cap) |
| Delivery 22 Port | Not applicable to this part |
| Exhaust Port | 3/8 PTC (90Adeg Elbow / Composite / Gray Cap) |
| Market Indicator | Aftermarket New |
| Maximum Operating Temperature | 200 AdegF (93 AdegC) |
| Minimum Operating Temperature | -40 AdegF (-40 AdegC) |
| Mounting | A~ .236 IN (4x) |
| Supply 11 Port | 3/8 PTC (90Adeg Elbow / Composite / Green Cap) |
| Supply 12 Port | 3/8 PTC (90Adeg Elbow / Composite / Red Cap) |
| Tractor Trip Pressure | 35 A+- 5 PSI |
| Trailer Override Pressure | Not applicable to this part |
| Trailer Trip Pressure | Not applicable to this part |
| VMRS Code 2 | 013-010-049 |
| VMRS Description 2 | Parking Valve - Tractor |
| Country of Origin (Primary) | MX |
| UPC | 04068078224632 |
| VMRS Code | 013010017 |
| Brand | Part Number |
|---|---|
| BWK022131 | |
| N/A | 298818N |
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