Castair 7.5HP 1-Phase Rotary Screw Air Compressor 80 Gallon Vertical — R718VP75
The Castair R718VP75 is a 7.5-horsepower, 1-Phase, 230V, 80-gallon vertical rotary screw air compressor delivering 31 CFM at 100 PSI. It weighs 555 pounds and measures 34×26×70 inches (L×W×H). If a 5HP rotary screw handles one tech comfortably, the 7.5HP handles two — and still has headroom. At 31 CFM, you can run a 1-inch impact, a DA sander, and a couple of ratchets simultaneously without pressure drop. This is the compressor for a 2-3 bay shop doing production work, a body shop with active spray and sanding going on at the same time, or any operation where the 5HP unit gets close to its limit during busy periods.
31 CFM at 100 PSI — What That Changes in a Shop
- Upgrade from 5HP: The 5HP rotary screw delivers 20 CFM. The 7.5HP delivers 31 CFM — 55% more output for a modest step up in cost and footprint (same tank size, same physical dimensions).
- Two-tech coverage: Two techs each running a 1/2" impact simultaneously draw 8-16 CFM — well within this unit's output. Add blow guns and an air ratchet and you're still fine.
- DA sanding plus spray: A DA sander at 12-20 CFM and an HVLP gun at 9-14 CFM is 21-34 CFM combined. The 7.5HP unit handles this range where the 5HP would start to show pressure drop at the peaks.
- 1-inch impact sustained use: Heavy-duty 1" impacts can draw 15-25 CFM under load. The 31 CFM output provides real headroom for sustained use — something the 5HP unit can't fully support during extended heavy pulls.
Vertical Tank — Footprint and Installation
- Dimensions: 34×26×70" (L×W×H) — 555 lbs
- Same physical size as the 5HP unit: The 7.5HP rotary screw uses the same 80-gallon tank as the 5HP. You get significantly more output in the identical footprint — this is one of the most practical reasons to go 7.5HP if you're choosing between the two.
- Small 34×26-inch floor footprint: Vertical configuration takes up minimal floor space — under 6 square feet. Suits shops where floor space is the limiting factor.
- 70-inch height: Confirm ceiling clearance before ordering. Standard 8-foot ceilings have adequate clearance.
1-Phase 230V Power
- 230V 1-Phase. Standard 230V single-phase — standard commercial power.
- Single-phase advantage: No 3-phase service required. Standard 230V single-phase commercial power. A 7.5HP single-phase motor draws more amperage than the 3-phase equivalent — verify your breaker and wire gauge can handle the load.
Castair Build Quality
- 100% duty cycle: 7.5HP rotary screw runs continuously. No piston-style thermal limits, no valve wear from pressure cycling.
- Cast iron construction throughout: All primary components in cast iron — not aluminum. Handles the thermal cycling of sustained production use.
- Industrial 1725 RPM motor, full 15% service factor: Heavy-duty motor designed for continuous commercial duty.
- Single solenoid air end control: No computers, no lockout codes, no proprietary systems. Simple, field-repairable.
- Analog pressure and temperature gauges standard: Easy to read, nothing to interpret.
- High pressure and dual high temperature shutdown standard: Built-in protection — not an option.
- Factory-filled with Cast-Lube synthetic oil: 4,000-hour or one-year change interval.
- Built-in air/oil separator with spin-on filter: Keeps oil out of the air supply.
- Off-shelf V-belts with adjustable tensioner: Standard belts from any industrial supply.
- Air/oil lines in copper pipe: Heat and vibration resistant, standard fittings.
- Air-cooled aftercooler/oil cooler standard: Removable for cleaning.
- Hour meter standard: Maintenance scheduling by actual run hours.
- 10-minute auto shutdown timer: Electricity savings when air demand stops.
- ASME-rated 80-gallon tank: Code-compliant for commercial installation.
- Pre-wired magnetic starter and controls: Connect incoming 230V power and run.
- Pressure options: 135 PSI standard, 150 or 175 PSI available.
- 2-year warranty on air end, electric motor, and tank
- Made in Spicer, Minnesota
Available Configurations — 7.5HP Rotary Screw Lineup
- R718HP75: 7.5HP, 1-Phase 230V, 80 Gal Horizontal — 31 CFM @ 100 PSI — 64×32×44" — 555 lbs
- R718VP75: 7.5HP, 1-Phase 230V, 80 Gal Vertical — 31 CFM @ 100 PSI — 34×26×70" — 555 lbs
- R718HG11: 7.5HP, 1-Phase, 80 Gal Horizontal, G11 air end
- R718VG11: 7.5HP, 1-Phase, 80 Gal Vertical, G11 air end
- R738HP75: 7.5HP, 3-Phase 230V, 80 Gal Horizontal — 31 CFM @ 100 PSI — 64×32×44" — 546 lbs
- R738VP75: 7.5HP, 3-Phase 230V, 80 Gal Vertical — 31 CFM @ 100 PSI — 34×26×70" — 546 lbs
- R738HG11: 7.5HP, 3-Phase, 80 Gal Horizontal, G11 air end, 230 or 460V
- Step down: R518HP75/VP75 — 5HP, 20 CFM @ 100 PSI — same tank, less output, lower cost
- Step up — 10HP+: Call for pricing and availability on 10HP and above
When Does a Shop Need This vs. Stepping Up or Down?
- Right for: 2-3 bay shop, two techs running air tools regularly, body shop with simultaneous sanding and painting, transmission shop with heavy impact use. The 31 CFM @ 100 PSI covers multi-tech simultaneous use without pressure drop.
- Step down to 5HP (R518HP75/VP75) if: You primarily have one tech working at a time and your demand is genuinely intermittent. The 20 CFM output is adequate, and you save on purchase cost — same physical size, same tank.
- Step up to 10HP if: You're running three or more techs simultaneously with heavy air tool loads, or if you run continuous high-demand equipment like large spray booths or pneumatic lifts. Call for pricing on 10HP and above.
- Phase choice: If 3-phase is available, use it (R738HP75/VP75). Lower amp draw, smoother starts, simpler motor construction. Single-phase (R718HP75/VP75) is for shops without 3-phase service.
- G11 vs. P75 air end: Same output, different screw element. PM kit and filters differ. Confirm which you're ordering before buying maintenance supplies.
Technical Specifications
- Model: R718VP75
- Horsepower: 7.5 HP
- Phase: 1-Phase
- Voltage: 230V
- Tank: 80 gallon, vertical, ASME-rated
- Air End: P75
- CFM @ 100 PSI: 31
- Dimensions (L×W×H): 34×26×70"
- Weight: 555 lbs
- Compressor Type: Rotary screw
- Duty Cycle: 100%
- Standard Pressure: 135 PSI (150 or 175 PSI optional)
- Motor Speed: 1725 RPM industrial, full 15% service factor
- Drive: Belt drive, off-shelf V-belts with adjustable tensioner
- Lubrication: Oil-injected, Cast-Lube synthetic, 4,000-hour/1-year interval
- Controls: Single solenoid, pre-wired magnetic starter, analog gauges, hour meter, 10-minute auto shutdown
- Shutdowns: High pressure, dual high temperature (standard)
- Maintenance Kit: MKP75
- Warranty: 2-year on air end, electric motor, and tank
- Manufacturer: Castair, Inc. (Spicer, Minnesota)
What's in the Box
- Castair rotary screw compressor (P75 air end) mounted on 80-gallon vertical ASME tank
- Pre-wired magnetic starter and controls for 230V 1-Phase
- Air/oil separator with spin-on filter
- Air-cooled aftercooler/oil cooler
- Hour meter
- Pre-filled with Cast-Lube synthetic oil
- Analog pressure and temperature gauges installed
Recommended Accessories
- Preventative Maintenance Kit (MKP75): 2 air filters, 4 oil filters, 1 separator filter, 5 gallons Cast-Lube oil — 10% savings over individual purchase
- Auto Tank Drain SDV03M: Automatic condensate purging — essential for humid climates or high-cycle use
- Vibration Pads VP1004: 4"×4"×1" set of 4 — reduces vibration transmission to floor
- Ball Valve BV75 (3/4") or BV100 (1"): Full-flow outlet shutoff — use 1" for 7.5HP and above
- Metal Flex Hose VA075 (3/4" NPT × 18") or VA100 (1"): Vibration isolation between tank and shop plumbing
Why Buy From Air Compressor Factory Direct?
- Castair specialist: We know the 7.5HP lineup — phase options, air end variants, and the accessories that go with each configuration
- Free shipping on qualifying orders
- Free technical support: Call 866-217-0063 — we'll help you confirm 5HP vs. 7.5HP, phase requirement, and tank orientation before you order
- Full manufacturer warranty honored and supported
- Honest sizing advice: If a 5HP unit handles your actual demand, we'll tell you. If you're running two bays hard and the 7.5HP is what you need, we'll confirm that too
Call 866-217-0063 for quick answers and help!
