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VIAIR 400P EF Automatic Portable Compressor (part 40145)
Model: 400P EF Automatic / 40145 · US configuration
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Part 40145 is a clamp-powered EF update with a 30-foot hose and trigger gun. Despite “Automatic” in its name, the exact manual describes operator-controlled tire pressure, not an entered-pressure stop.
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Assessment scenario: 40145 EF direct-clamp manual tire inflation
An assessment scenario for a suitable 12V direct-battery connection and a driver who wants the 40145 30-foot hose and trigger gun, accepts manual pressure checks, and has no essential need for preset tire stopping. The pump pressure switch protects the compressor, not a selected tire target.
Explore this buying guide ↗Why consider this model?
- The exact product page and manual identify 400P EF Automatic / part 40145 and a 12V, 30A battery-clamp setup with a 40A fuse.
- The listed kit includes a 30-foot hose and trigger-style inflation gun for manual pressure control.
- The product page lists a Presta adapter; check that it is in the exact seller package if bicycle use matters.
Tradeoffs to weigh
- The dedicated manual does not document a user-selected tire-pressure stop; the fixed 130/155-PSI switch is pump protection.
- This is not documented for an accessory socket or cordless use; the manual says the engine must run.
- VIAIR’s EF performance language is a manufacturer claim, not a fill-time guarantee for a particular tire.
Check these before ordering
- Confirm part 40145 / 400P EF Automatic rather than 40043, 40045 or the RV-specific 40144.
- Check the battery clamps, 40A fuse, 30-foot hose, gun, tip kit and Presta adapter against the seller’s package.
- Use the tire maker’s pressure, stay present, follow the manual’s duty limits and let hot components cool before storage.