Check valve with a 3/8in FNPT port (SMC NAK4000-N03) that allows air flow in one direction to hold pressure in an air-suspension or air-management system. Universal air-suspension hardware.
| Type | Check valve |
| Thread | 3/8in FNPT |
| OEM Reference | SMC NAK4000-N03 |
| Function | Air suspension |
| Fitment | Universal (air suspension) |
| Part Number | 22664 |
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