{"product_id":"castair-7-5-hp-3-phase-compressor-cube-pump-cfm-35-rpm-585-i73cuc2-s","title":"Castair 7.5 HP 3 Phase Compressor Cube Pump  CFM@ 35 RPM 585 I73CUC2-S","description":"\u003cp\u003eThe Castair I73CUC2-S is a 7.5 HP, 3-phase industrial air compressor in a cube (tankless) configuration with the C2 pump and a factory-mounted magnetic motor starter. The C2 pump runs at 585 RPM and produces 35.0 CFM at 0 PSI and 28.1 CFM at 175 PSI — that's the highest CFM output in the 7.5HP 3-phase cube lineup. Like the I73CUC1-S, this unit ships without a receiver tank, making it the right choice for installations where a separate ASME tank is already in place or being specified independently.\u003c\/p\u003e\n\n\u003cp\u003eThe C2 is a V4 four-cylinder cast iron pump — four cylinders in a V arrangement — running at a lower shaft speed than the C1's 895 RPM. The lower RPM produces less heat per operating hour and more air per revolution. For a high-demand shop that needs maximum CFM from a 7.5HP motor but is doing a custom or central-plant installation, the I73CUC2-S delivers the most airflow in this format.\u003c\/p\u003e\n\n\u003ch2\u003eC1 vs. C2 Cube Pump — Which Do You Need\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eI73CUC1-S (C1 pump):\u003c\/strong\u003e 895 RPM, 24.8 CFM@175PSI — handles general shop demand, 2-3 air tools simultaneously\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eI73CUC2-S (C2 pump, this unit):\u003c\/strong\u003e 585 RPM, 28.1 CFM@175PSI — handles heavier demand, spray guns, DA tools, or multi-tool use\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrice difference:\u003c\/strong\u003e The C2 unit runs approximately $691 more than the C1 — compare whether your shop's sustained tool demand justifies the higher CFM before ordering\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003ePump Features — Cast Iron C2 Two-Stage V4\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAll cast iron V4 cylinder configuration:\u003c\/strong\u003e Four cylinders in a V arrangement — more displacement than the C1 inline-2, producing higher CFM at lower shaft speed\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSlow 585 RPM operation:\u003c\/strong\u003e Lower heat per hour, reduced wear, quieter operation than faster-turning pump designs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTapered roller bearings at both crankshaft ends:\u003c\/strong\u003e Handles the higher loads of the larger V4 pump under sustained two-stage compression\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision steel connecting rods:\u003c\/strong\u003e Automotive-type rod insert bearings at crankshaft, needle bearings at wrist pin\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDisc and spring valves:\u003c\/strong\u003e Field-serviceable, reliable under continuous duty cycling\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-ring pistons:\u003c\/strong\u003e Less oil carry-over into the discharge air stream\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCentrifugal unloader:\u003c\/strong\u003e No-load start every cycle — head pressure releases before the motor cranks up\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eMotor and Electrical\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e1,725 RPM heavy-duty industrial motor:\u003c\/strong\u003e Full 15% service factor — continuous duty rated\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFactory-mounted magnetic motor starter:\u003c\/strong\u003e 3-phase overload protection, wired at the factory\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3-phase operation:\u003c\/strong\u003e Smooth starts, lower peak current draw, better motor longevity vs. single-phase\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eCastair I73CUC2-S cube compressor assembly (C2 pump, motor, base\/cube frame, belt drive, belt guard)\u003c\/li\u003e\n\u003cli\u003eFactory-mounted magnetic motor starter (3-phase, sized for 7.5HP)\u003c\/li\u003e\n\u003cli\u003eCopper discharge and unloader tube (installed)\u003c\/li\u003e\n\u003cli\u003ePressure switch (installed)\u003c\/li\u003e\n\u003cli\u003e\u003cem\u003eTank not included — this is a tankless cube pump unit\u003c\/em\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eAvailable Configurations\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eI73CUC1-S:\u003c\/strong\u003e 7.5HP, 3-phase, cube (tankless), C1 pump, 895 RPM, 24.8 CFM@175PSI, magnetic starter\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eI73CUC2-S (this unit):\u003c\/strong\u003e 7.5HP, 3-phase, cube (tankless), C2 pump, 585 RPM, 28.1 CFM@175PSI, magnetic starter\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eI738HC2-S:\u003c\/strong\u003e Same C2 pump and motor, plus 80-gal horizontal ASME tank — 64x20x46 in., 730 lbs, complete unit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eI738VC2-S:\u003c\/strong\u003e Same C2 pump and motor, plus 80-gal vertical ASME tank — 40x24x74 in., 730 lbs, complete unit\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhen Does a Shop Need This vs. Stepping Up or Down\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eChoose the I73CUC2-S\u003c\/strong\u003e when you need the maximum CFM of the C2 pump in a cube\/tankless configuration for a custom industrial installation, replacement job, or central-plant setup. At 28.1 CFM at 175 PSI, this unit can handle spray guns, DA polishers, and multi-tool shop environments when paired with an appropriately sized receiver tank.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eChoose I73CUC1-S instead\u003c\/strong\u003e if your shop's air demand is satisfied by 24.8 CFM at 175 PSI — the C1 cube unit is approximately $691 less and covers most general automotive service needs.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eBuy a full unit (I738HC2-S or I738VC2-S)\u003c\/strong\u003e if you need the complete compressor including the tank. The cube configuration is specifically for situations where the tank is handled separately.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e I73CUC2-S\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHorsepower:\u003c\/strong\u003e 7.5 HP\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePhase:\u003c\/strong\u003e 3-phase\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConfiguration:\u003c\/strong\u003e Cube \/ Tankless\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTank:\u003c\/strong\u003e Not included\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePump Model:\u003c\/strong\u003e C2 (two-stage, cast iron, V4)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePump RPM:\u003c\/strong\u003e 585\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCFM @ 0 PSI:\u003c\/strong\u003e 35.0\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCFM @ 175 PSI:\u003c\/strong\u003e 28.1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMax Working Pressure:\u003c\/strong\u003e 175 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMotor Speed:\u003c\/strong\u003e 1,725 RPM\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStarter:\u003c\/strong\u003e Factory-mounted magnetic motor starter included\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDischarge Tube:\u003c\/strong\u003e Copper\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBelt Guard:\u003c\/strong\u003e Metal, fully enclosed\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy Buy From Air Compressor Factory Direct?\u003c\/h3\u003e\n\u003cp\u003eWe specialize in industrial and commercial air compressors and have been matching shops to the right equipment since 2016. When you call us, you're talking to someone who knows the Castair lineup — pump models, tank options, starter requirements, CFM calculations for your tool mix. Free shipping, free technical support at 866-217-0063, and the full Castair manufacturer warranty. If you're comparing cube pump configurations or deciding between the C1 and C2, call us.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCall 866-217-0063 for quick answers and help!\u003c\/strong\u003e\u003c\/p\u003e","brand":"Cast Air","offers":[{"title":"Default Title","offer_id":53342569758933,"sku":"I73CUC2-S","price":7443.64,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0622\/8466\/0949\/files\/cube-1_a50f24d5-4cb6-452a-af7b-3d8dfed373d4.jpg?v=1772652724","url":"https:\/\/aircompressorfactorydirect.com\/products\/castair-7-5-hp-3-phase-compressor-cube-pump-cfm-35-rpm-585-i73cuc2-s","provider":"Air Compressor Factory Direct","version":"1.0","type":"link"}