{"product_id":"castair-7-5-hp-3-phase-compressor-cube-pump-cfm-32-4-rpm-895-i73cuc1-s","title":"Castair 7.5 HP 3 Phase Compressor Cube Pump  CFM@ 32.4 RPM 895 I73CUC1-S","description":"\u003cp\u003eThe Castair I73CUC1-S is a 7.5 HP, 3-phase industrial air compressor in a \"cube\" configuration — the pump and motor are mounted on a compact base without a receiver tank. This is a specialty configuration for shops or industrial applications that have a remote or central receiver tank already installed, or where a separate ASME tank is being sized and specified independently. The C1 pump runs at 895 RPM and delivers 32.4 CFM at 0 PSI (24.8 CFM at 175 PSI) — the same output as the I738VC1-S and I738HC1-S, just without the tank assembly.\u003c\/p\u003e\n\n\u003cp\u003eThe cube configuration is less common in general shop installations but standard in industrial settings where a central receiver feeds multiple branch lines across a large facility, or where replacement of a pump\/motor unit on an existing tank is needed. If you're replacing an existing compressor pump and motor while retaining your tank, this is worth a call to confirm compatibility before ordering.\u003c\/p\u003e\n\n\u003ch2\u003eWhen a Cube Pump Configuration Makes Sense\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCentral plant \/ remote receiver:\u003c\/strong\u003e Your facility has a large central air receiver (100+ gallons) already plumbed to your shop — you need the pump and motor unit but the tank is staying put\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplacement pump installation:\u003c\/strong\u003e The existing compressor tank is in good condition but the pump or motor has failed — a cube unit lets you mount a new pump and motor on the existing base or a new saddle\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCustom installations:\u003c\/strong\u003e Your installer or integrator is handling the full system design including tank sizing, after-coolers, and piping — they want the pump\/motor unit only\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLimited ceiling height:\u003c\/strong\u003e A vertical tank may not fit and you want to design a low-profile installation with a separate horizontal tank mounted elsewhere\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003ePump Features — Cast Iron C1 Two-Stage\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAll cast iron construction:\u003c\/strong\u003e Cylinders, heads, and crankcase — no aluminum components in the compression path\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSlow 895 RPM operation:\u003c\/strong\u003e Belt-driven from the 1,725 RPM industrial motor, keeping heat and wear low across a long service life\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTapered roller bearings at both crankshaft ends:\u003c\/strong\u003e Superior support for the two-stage pump loads and belt-drive side loads\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 Easy to service in the field, reliable under sustained pressure cycling\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-ring pistons:\u003c\/strong\u003e Reduced oil carry-over into the discharge air\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCentrifugal unloader:\u003c\/strong\u003e Every start is a no-load start — head pressure releases before the motor torques 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 or higher — continuous duty rated\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFactory-mounted magnetic motor starter (-S):\u003c\/strong\u003e 3-phase overload protection installed at the factory and wired to the unit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3-phase operation:\u003c\/strong\u003e Smooth starts, lower peak current draw, longer motor life vs. single-phase\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat's in the Box\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCastair I73CUC1-S cube compressor assembly (C1 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 (this unit):\u003c\/strong\u003e 7.5HP, 3-phase, cube (tankless), C1 pump, 895 RPM, 32.4 CFM@0PSI \/ 24.8 CFM@175PSI, magnetic starter included\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eI73CUC2-S:\u003c\/strong\u003e 7.5HP, 3-phase, cube (tankless), C2 pump, 585 RPM, 35.0 CFM@0PSI \/ 28.1 CFM@175PSI, magnetic starter included\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eI738HC1-S:\u003c\/strong\u003e Same C1 pump, motor, plus 80-gal horizontal ASME tank — 64x20x48 in., 625 lbs, full compressor unit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eI738VC1-S:\u003c\/strong\u003e Same C1 pump, motor, plus 80-gal vertical ASME tank — 32x24x74 in., 625 lbs, full compressor unit\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhen Does a Shop Need This vs. a Full Unit\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eBuy the I73CUC1-S\u003c\/strong\u003e when you already have an ASME-rated receiver tank in your installation and need the pump and motor assembly only. This saves the cost of a tank you don't need and may simplify your installation if the tank is being custom-fabricated or is already in place.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eBuy the I738HC1-S or I738VC1-S instead\u003c\/strong\u003e if you need a complete, ready-to-operate compressor including the tank. Those units ship as a complete assembly with the ASME tank already mounted and the pump\/motor ready to go.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eChoose I73CUC2-S\u003c\/strong\u003e if you need the higher CFM output of the C2 pump (28.1 vs. 24.8 CFM at 175 PSI) in the cube configuration.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e I73CUC1-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 C1 (two-stage, cast iron, inline-2)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePump RPM:\u003c\/strong\u003e 895\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCFM @ 0 PSI:\u003c\/strong\u003e 32.4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCFM @ 175 PSI:\u003c\/strong\u003e 24.8\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":53342569726165,"sku":"I73CUC1-S","price":6168.48,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0622\/8466\/0949\/files\/cube-1_8fd67687-edab-4a29-831c-d954e4d4b216.jpg?v=1772652722","url":"https:\/\/aircompressorfactorydirect.com\/products\/castair-7-5-hp-3-phase-compressor-cube-pump-cfm-32-4-rpm-895-i73cuc1-s","provider":"Air Compressor Factory Direct","version":"1.0","type":"link"}