{"product_id":"castair-1-5-hp-single-stage-1-cylinder-w-motor-air-compressor-bare-pump-no-flywheel-8-oz-oil-capacity-dd20","title":"Castair 1.5 HP Single Stage 1 Cylinder w\/motor Air Compressor Bare Pump No Flywheel 8 oz. Oil Capacity DD20","description":"\u003cp\u003eThe Castair DD20 is a 1.5 HP single-stage, single-cylinder cast iron air compressor pump sold as a bare pump unit with the motor already mounted — but no flywheel. At 45 pounds, it's the lightest motor-mounted bare pump in the Castair lineup, sized for compressor builds where you already have or are sourcing a flywheel and tank separately. This is a component sale, not a complete compressor. It's what you buy when you're rebuilding an existing machine, building a custom unit from scratch, or replacing a failed pump-and-motor assembly on a smaller portable or stationary compressor.\u003c\/p\u003e\n\n\u003ch2\u003eWhat You're Getting — And What You're Not\u003c\/h2\u003e\n\u003cp\u003eThe DD20 comes with the pump and motor assembled together — the motor is already mounted to the pump crankcase. This saves you from having to source a compatible motor separately and figure out shaft sizing and frame matching. What it does not include is a flywheel. If you're replacing a pump in an existing compressor, you may be able to reuse the original flywheel. If you're building new, you'll need to source a flywheel that fits the pump's 1-inch keyed crankshaft (verify shaft specs before ordering).\u003c\/p\u003e\n\n\u003cp\u003eThis is also a bare pump — no tank, no pressure switch, no safety valve, no gauges, no air filter. All of those are separate. For a complete compressor build or rebuild using the DD20, you'll also need to source those components, either individually from Castair's accessories and major components catalog or from your existing compressor if you're doing a pump swap.\u003c\/p\u003e\n\n\u003ch2\u003ePump Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e DD20\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHorsepower:\u003c\/strong\u003e 1.5 HP\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStage:\u003c\/strong\u003e Single-stage\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCylinder configuration:\u003c\/strong\u003e 1 cylinder\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlywheel:\u003c\/strong\u003e None included (flywheel sold separately)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOil capacity:\u003c\/strong\u003e 8 oz.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 45 lbs (pump with motor, no flywheel)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1 year parts only when properly installed and maintained\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow DD20 Fits the Castair Pump Lineup\u003c\/h3\u003e\n\u003cp\u003eCastair's cast iron bare pump lineup covers a wide range of HP from 1.5 HP single-cylinder units up to 15–25 HP two-stage V4 assemblies. Here's where the DD20 sits:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePK20 (1.5 HP, 20 lbs, 7.5\" flywheel):\u003c\/strong\u003e Lightest unit, flywheel included — for new builds where you want everything in one purchase\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDD20 (1.5 HP, 45 lbs, no flywheel, motor included):\u003c\/strong\u003e Same pump with motor pre-mounted, no flywheel — for rebuilds or custom builds where you already have a flywheel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePK30 (1.5 HP, 45 lbs, 10\" flywheel):\u003c\/strong\u003e Same 1.5 HP class with flywheel included\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePK50 (2 HP, 50 lbs, V2):\u003c\/strong\u003e Step up to 2 HP if your application demands it\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePK60 (3.5 HP, 55 lbs, V2):\u003c\/strong\u003e Mid-range for more CFM output\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhat This Pump Is Used For\u003c\/h2\u003e\n\u003cp\u003eA 1.5 HP single-cylinder pump produces enough CFM for light shop use — one air tool at a time, inflating tires, running a small brad nailer or stapler, or light blowing and cleaning tasks. It's not a production shop pump. It's appropriate for:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHobbyist and home garage compressors\u003c\/strong\u003e (tire inflation, light spraying, air tools with low CFM demand)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSmall portable compressor rebuilds\u003c\/strong\u003e where the original pump has failed and you want to maintain the original form factor\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM replacement\u003c\/strong\u003e on equipment built around this pump size\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCustom builds\u003c\/strong\u003e where 1.5 HP single-stage capacity fits the intended application\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIf you need more than one air tool running at a time, or you're running impact wrenches and air ratchets continuously, look at the 2 HP (PK50) or 3.5 HP (PK60) options.\u003c\/p\u003e\n\n\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eDD20 cast iron pump assembly with motor pre-mounted\u003c\/li\u003e\n\u003cli\u003e8 oz. oil capacity crankcase (oil not included)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eFlywheel, tank, pressure switch, safety valve, gauges, air filter, and all plumbing are not included and must be sourced separately.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eCastair recommends using Castair 30-weight non-detergent compressor oil\u003c\/li\u003e\n\u003cli\u003eFlywheel must match crankshaft specifications — verify before purchasing a flywheel separately\u003c\/li\u003e\n\u003cli\u003eMotor voltage and phase must match your electrical supply — contact us to confirm motor specs on this unit before ordering\u003c\/li\u003e\n\u003cli\u003eWarranty requires proper installation and maintenance per Castair's guidelines\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy Buy From Air Compressor Factory Direct?\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecialist since 2016\u003c\/strong\u003e — we stock Castair pumps and can help you confirm the DD20 fits your rebuild or build project\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFree shipping\u003c\/strong\u003e on qualifying orders\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFree tech support at 866-217-0063\u003c\/strong\u003e — call before ordering if you're not certain about flywheel compatibility or motor specs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFull manufacturer warranty\u003c\/strong\u003e — 1 year parts when properly installed\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHonest guidance\u003c\/strong\u003e — if you need a PK30 or PK50 instead, we'll tell you\u003c\/li\u003e\n\u003c\/ul\u003e\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":53342545281237,"sku":"DD20","price":758.28,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0622\/8466\/0949\/files\/CastAirTwoStageAirCompressorPump_9eea5552-fad7-4a8c-9624-fbc452c4d4a7.png?v=1772652665","url":"https:\/\/aircompressorfactorydirect.com\/products\/castair-1-5-hp-single-stage-1-cylinder-w-motor-air-compressor-bare-pump-no-flywheel-8-oz-oil-capacity-dd20","provider":"Air Compressor Factory Direct","version":"1.0","type":"link"}