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VIAIR's 300P sits alongside the 400P in the brand's portable compressor range, sharing several key published specifications. This review is based on VIAIR's own specification pages, not a first-hand fill-time test.
The 300P shares VIAIR's 2.30 CFM at 0 PSI rating and 33% duty cycle at 100 PSI with the 400P, at a 150 PSI max working pressure — positioning it as a close sibling to the 400P rather than a clearly distinct output tier.
Why You Should Get This
VIAIR's own published specs put the 300P's CFM and duty-cycle figures in the same range as the 400P, making it a genuine mid-tier option for truck and SUV tire sizes without stepping all the way up to VIAIR's onboard-class systems.
Benefits
- 150 PSI max working pressure, matching the 400P's ceiling.
- 2.30 CFM at 0 PSI, VIAIR's stated rating shared with the 400P line.
- SXS and RVS variants available for UTV and towable-trailer specific mounting needs.
Pros and Cons
- Comparable CFM and duty-cycle specs to the more established 400P at a typically lower price point.
- 150 PSI ceiling suits a broad range of tire types and pressures.
- Sold in multiple configuration variants (standard, SXS, RVS) for different mounting needs.
- Spec overlap with the 400P can make choosing between the two confusing without checking each listing's exact current spec.
- 30-amp draw again generally exceeds a standard cigarette-lighter socket fuse rating.
- Still a portable unit, not a constant-duty onboard system, for anyone airing up very frequently.
Confirm with the seller for your exact year/trim tire size before ordering.
CFM and Pressure Specs, Compared to the 400P
VIAIR states the 300P delivers 2.30 CFM at 0 PSI with a 150 PSI max working pressure — the same headline figures the manufacturer publishes for the 400P. That overlap means the meaningful differences between the two models, for a given buyer, are more likely to come down to a specific listing's included accessories, physical size or current price than a clear output-tier gap; checking both models' current listings side by side is worth doing before assuming one is a strict upgrade over the other.
Duty Cycle: 33% at 100 PSI
VIAIR's published duty cycle for the 300P is 33% at 100 PSI, matching the 400P's figure at that pressure — meaning roughly a third of the time running to two-thirds cooldown once pressure climbs to 100 PSI. For a full 4-tire air-up job at standard passenger or light-truck pressures well under 100 PSI, this ceiling is less likely to come into play than it would for airing a specialty high-pressure application.
SXS and RVS Variants
VIAIR sells the 300P in multiple configuration variants beyond the standard portable unit: an SXS version built with a two-position SAE connector and compressor tie-downs specifically for UTV mounting, and an RVS version marketed for towable trailers, per the manufacturer's product listings. Checking which specific variant matches an intended mounting and use case — standard truck use, UTV-mounted, or trailer-specific — matters more here than for a single-configuration model like the 88P.
Power Draw and Wiring
VIAIR rates the 300P's max draw at 30 amps, matching the 400P EF and generally exceeding a standard cigarette-lighter socket's fuse rating, consistent with VIAIR positioning both models toward direct battery-clamp connections rather than plug-in-only use, per our hub's guidance on matching compressor draw to vehicle wiring. VIAIR also states an IP54 ingress protection rating for the 300P — a step up from the 88P's IP53 — and lists the unit at 9.0 by 4.9 by 7.5 inches and 8.70 lbs, with a 25-foot air hose and 8-foot power cord.
Choosing Between the 300P, 400P EF and 88P
Given the overlapping CFM, pressure and duty-cycle specs with the 400P EF, the practical choice for most buyers comes down to a specific listing's price, included accessories, physical size and available variant (SXS, RVS or standard) rather than a meaningful output gap between the two models. VIAIR's own comparative numbers below show both units clearly outclass the compact 88P and sit well below the dual-head 444C for larger truck and off-road tire use:
| Model | CFM @ 0 PSI | Max pressure | Duty cycle | Max amp draw | Dimensions |
|---|---|---|---|---|---|
| 88P | 1.97 | 120 PSI | 25 min @ 30 PSI | 20 A | 9.8" x 3.2" x 5.6" |
| 300P | 2.30 | 150 PSI | 33% @ 100 PSI | 30 A | 9.0" x 4.9" x 7.5" |
| 400P EF | 2.30 (VIAIR's base 400P spec sheet; the EF listing publishes duty cycle but not a separate CFM figure) | 150 PSI | 100% @ 40 PSI, 33% @ 100 PSI | 30 A | 11.8" x 7.57" x 6.69" |
| 444C (each of 2 heads) | 3.53 (7.06 combined) | 200 PSI | 100% @ 100 PSI, 50% @ 200 PSI | 46 A combined | 10.87" x 4.2" x 7.06" each |
How We Research This Review
This review is drawn from VIAIR's own published specification pages for the 300P and its variants, cross-referenced against the 400P EF, 88P and 444C for comparison, and general fill-time guidance from our air compressors and tire deflators hub. We do not buy or physically test compressors ourselves — see how we rank for the full method and affiliate disclosure for how the site is funded.
Reported failures & warranty
No widespread failures documented in the sources we checked; see the maker's warranty terms.
VIAIR — 300P Portable Compressor Specifications — see warranty/spec terms
Research log
- 2026-09-26:Specs and claims for VIAIR 300P portable air compressor researched from VIAIR — 300P Portable Compressor Specifications and the other sources cited below.
Sources
- VIAIR — 300P Portable Compressor Specifications — VIAIR 300P: 2.30 CFM at 0 PSI, 150 PSI max working pressure, 33% duty cycle at 100 PSI, 30-amp max draw, IP54, 9.0 x 4.9 x 7.5 in, 8.70 lb, 25 ft hose / 8 ft cord.
- VIAIR — 400P Portable Compressor Specifications — Base VIAIR 400P: 2.30 CFM at 0 PSI, 150 PSI max, 33% duty cycle at 100 PSI, 30-amp draw, IP54 — the comparison point for the 300P's overlapping specs.
- VIAIR — 400P EF Portable Compressor Specifications — VIAIR 400P EF: 150 PSI max, 100% duty cycle at 40 PSI (33% at 100 PSI), 30-amp draw, IP54, 11.8 x 7.57 x 6.69 in.
- VIAIR — 88P Portable Compressor Specifications — VIAIR 88P: 1.97 CFM at 0 PSI, 120 PSI max, 25-minute duty cycle at 30 PSI, 20-amp draw — the entry-level comparison point.
- VIAIR — 444C Dual Performance Value Pack — 444C combined 7.06 CFM at 0 PSI, 200 PSI max, 100% duty cycle at 100 PSI, 46-amp combined draw — top of VIAIR's portable lineup for comparison.
- VIAIR — 300P SXS Portable Compressor — 300P SXS variant built with a two-position SAE connector and compressor tie-downs for UTV mounting.
- VIAIR — 300P RVS Portable Compressor — 300P RVS variant marketed for towable trailers.