Cast Air D7324HC2-S Heavy Duty Shop Air Compressor — Duplex Series
The Cast Air D7324HC2-S is a duplex-configuration heavy-duty shop air compressor built for automotive dealerships, fleet maintenance operations, truck repair shops, and commercial facilities where single-pump compressors cannot meet the demand. At $9,723.50, this duplex unit runs two independent cast iron pump assemblies on a shared ASME-rated air receiver — giving you redundant capacity, alternating operation to extend pump life, and the volume to serve multiple service bays without pressure drops.
Why Duplex: The Case for Two Pumps
Single-pump compressors work for most shops. A duplex compressor is for shops where a single-pump failure cannot be tolerated. Two pumps on one tank means: the lead pump handles normal demand; the lag pump stages in when demand spikes; they alternate on a timer so each logs half the run hours; and if one pump needs service, the shop keeps running on the other. For dealership service departments running 8-12 bays or fleet shops that cannot send technicians home because the compressor is down, a duplex system is the correct infrastructure investment.
Key Features
- Dual Cast Iron Pumps: Two independent splash-lubricated cast iron pump assemblies on one shared tank — each rebuildable, each running at reduced duty cycle
- Alternating Lead-Lag Control: Automatic alternating control cycles between pump 1 and pump 2 to equalize wear hours; when demand exceeds single-pump output, both run in parallel
- Large-Capacity ASME Tank: Shared high-volume air receiver provides deep storage for simultaneous multi-tool demand
- Single-Phase Power: High-capacity 7.5 HP duplex operation on standard 240V service — no industrial electrical required
- Industrial Motors: Two 7.5 HP single-phase industrial motors — mid-tier duplex ideal for 4-8 bay shops needing redundancy without three-phase service
- Low-Speed Pump Operation: Cast iron duplex pumps run at lower RPM for cooler operation, less heat fatigue, and longer rebuild intervals
- Commercial Safety Package: ASME-rated tank, safety relief valves, pressure gauges, drain provisions on both pump assemblies
- Rebuildable Pump Design: Valve kits, ring sets, gaskets, and bearings are available — rebuild the pump, do not replace the unit
Who This Unit Is For
The D7324HC2-S is built for operations that run multiple air tools simultaneously and cannot tolerate downtime. Auto dealerships, tire wholesalers, commercial truck fleets, manufacturing facilities with pneumatic tooling, and any shop running three or more bays continuously will find the duplex format delivers what a single large-pump unit cannot: backup capacity during maintenance and reduced wear from alternating operation. The 7.5 HP rating and 30 (approx) tank combination covers high-demand shop environments.
Duplex Lineup Comparison
- 5 HP Duplex (D53xx series): Entry-level duplex — smaller shops moving from single-pump for redundancy, $6,800-$9,400
- 7.5 HP Duplex (D73xx/D71xx series): Mid-tier — 4-8 bay shops, balanced cost and capacity, $7,200-$9,840
- 10 HP Duplex (D103xx series): High-capacity — busy dealerships and fleet shops, $8,800-$13,850
Technical Specifications
Manufacturer specifications for this model are pending confirmation from Cast Air — contact us for the verified spec sheet. The following are derived from the Cast Air model number convention and standard duplex configuration:
- Model: D7324HC2-S
- Configuration: Duplex (dual pump, single tank)
- Horsepower: 7.5 HP (per pump)
- Tank Size: 30 (approx) Gallon (approximate — confirm with manufacturer)
- Phase: Single-Phase (240V)
- Manufacturer: Cast Air
- Price: $9,723.50
Why Buy From OEM Diagnostic Tools?
OEM Diagnostic Tools has been a specialist supplier of professional shop equipment since 2016. We carry the full Cast Air Duplex lineup and can help you size the right HP rating, tank volume, and phase configuration for your facility and electrical service. Every order ships free. Tech support at 866-217-0063 is staffed by people who understand the difference between a 5 HP duplex entry unit and a 10 HP three-phase installation. Full manufacturer warranty on every unit. Call us before you buy — we size it right the first time.
Call 866-217-0063 for quick answers and help!
