FS-Curtis ML20+ 240G 20HP(2) Duplex Tank Mounted Electric Air Compressor #ML20PLUS-D
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| Model / Part Number | ML20+ Duplex |
| Horsepower | 20 HP (x2, Duplex) |
| Tank | 240 Gallon Horizontal ASME |
| Airflow | 158.6 CFM @ 175 PSI |
| Pressure Range | 175 PSI |
| Warranty | 12 months |
FS-Curtis ML20PLUS-D — 20 HP (x2, Duplex) Air Compressor
A manufacturing plant running three production lines off one compressor had that single pump seize on a Tuesday morning, and every line went quiet for six hours while a tech drove out with a replacement — the plant manager isn't betting the whole operation on one pump again.
The FS-Curtis ML20PLUS-D is a duplex two-stage reciprocating compressor rated for 20 HP (x2, Duplex) with a 240 gallon horizontal ASME tank, built to deliver reliable, all-day compressed air for shops and commercial operations at a straightforward entry price.
Who the ML20PLUS-D Is Built For
- ✅ A manufacturing plant running multiple production lines off one air supply that's had a single-pump failure stop every line at once, needing a second independent pump for uptime insurance
- ✅ A facility with continuous high-draw demand across several stations simultaneously that a single 20 HP pump can't sustain alone
- ✅ An operation that can service one pump during a shift without shutting down air to the rest of the facility
- ✅ A facility engineer who's priced out the Ultra Pack duplex and decided the base configuration's lower cost is the better fit for now
- ✅ A large commercial or industrial facility standardizing on FS-Curtis's ML20+ tier for its highest-demand line
What the ML20PLUS-D Is NOT Built For
- ❌ Smaller facilities where a simplex ML20+ SH or HUP already covers the air draw
- ❌ Shops wanting factory auto-drain/dryer accessories standard — the Ultra Pack (ML20Plus-DUP) adds those, this base unit doesn't
- ❌ Facilities with limited floor space — the 240-gallon duplex tank has a large footprint
What Makes the ML20PLUS-D Different
Commercial 2-Stage Pump
The ML20PLUS-D uses a C98 (x2), Cast-Iron, Two-Stage pump built for daily, all-day duty cycles — not a hobby-grade single-stage unit that struggles under continuous shop use.
CFM & Pressure Output
158.6 CFM @ 175 PSI at up to 175 PSI translates to real-world headroom — enough to run impact wrenches, tire equipment, and paint tools without the compressor becoming the bottleneck.
Power Requirements
Three-Phase only, 230V/460V options available. Confirm your panel and breaker sizing with an electrician before delivery.
- Built-in pump redundancy
- 158.6 CFM combined output
- Multi-line manufacturing facilities
- Smaller facilities covered by simplex
- Tight floor space
ML20PLUS-D vs. FS-Curtis ML20Plus-SH (20 HP, Simplex) — Which Compressor Is Right for Your Shop?
| Decision Point | ML20PLUS-D | FS-Curtis ML20Plus-SH (20 HP, Simplex) |
|---|---|---|
| Horsepower / Tank | 20 HP x2 / 240 Gal Horizontal | 20 HP / 200 Gal Horizontal |
| CFM @ 175 PSI | 158.6 CFM combined | 79.3 CFM |
| Redundancy | Duplex — two independent pumps, built-in backup | Simplex — single pump, no built-in redundancy |
| Best fit | Facilities that can't tolerate a compressor going down | Facilities where redundancy isn't a hard requirement |
Choose the ML20PLUS-D when a compressor failure stopping multiple production lines is not an option. Choose the ML20Plus-SH for a simpler, lower-cost setup if redundancy isn't required. Both stay inside Alamo’s catalog — call (844) 480-6059.
Full Specifications — ML20PLUS-D
| Model / Part Number | ML20+ Duplex |
| Horsepower | 20 HP (x2, Duplex) |
| Pump | C98 (x2), Cast-Iron, Two-Stage |
| Configuration | Duplex Two-Stage Reciprocating |
| Tank | 240 Gallon Horizontal ASME |
| Airflow | 158.6 CFM @ 175 PSI |
| Pressure Range | 175 PSI |
| Motor / Electrical | Three-Phase only, 230V/460V options available |
| Phase / Hz / Voltage |
Three Phase: 3/60/200-208V (FML20C98D4S-A9L1XX) |
| Overall Dimensions | 95" L x 46" W x 73" H |
| Shipping Weight | 3500 lbs |
| Warranty | 12 months |
⚠️ Setup Requirements
- Electrical: Three-Phase only, 230V/460V options available; have an electrician confirm your panel capacity before delivery.
- Floor space: 95" L x 46" W x 73" H footprint; plan clear access on at least two sides for maintenance and tank drain.
- Ventilation: Locate in a dry, ventilated area away from dust and moisture to protect the pump and tank.
- Weight: 3500 lbs shipping weight — confirm your floor/dock can receive and position the unit.
- Setup: Installation is available as a quoted service (piping, electrical tie-in, functional test) — it’s not included in the purchase price. Call (844) 480-6059 for an install quote if you’d like Alamo’s crew to set it up.
FS-Curtis Warranty — ML20PLUS-D
FS-Curtis backs the ML20PLUS-D with a 1-year parts-only warranty.
| Component | Coverage Term |
|---|---|
| Tank & pump | 1 year parts |
| Motor & electrical components | 1 year parts |
| Wear items (belts, filters, gaskets) | Not covered (consumable) |
Warranty service is through Alamo Equipment & Service — call (844) 480-6059 instead of waiting on a manufacturer hotline. Coverage is subject to FS-Curtis warranty terms, conditions, and requirements.
Frequently Asked Questions — FS-Curtis ML20PLUS-D
Why Buy the ML20PLUS-D from Alamo Equipment & Service?
- Installation available. Buying online gets you the compressor — piping and electrical tie-in are an extra-charge service. We have the crews to install it and can quote that separately; call (844) 480-6059 for a quote.
- We service it. These compressors need preventative maintenance up to 4x a year per the manufacturer — oil changes, belt and air filter checks, contactor and electrical inspection. Call (844) 480-6059 for maintenance, repairs, or support — and if you ever need warranty work, we register your equipment with the manufacturer and handle the claim directly, so you’re not stuck navigating vendor support on your own.
- We size it with you. 20 HP (x2, Duplex), a 240 gallon horizontal ASME tank, 158.6 CFM @ 175 PSI — we’ll confirm this matches your shop’s actual air draw before you order.
- Free shipping. Ships free to the 48 contiguous states.
- Expert comparison help. Not sure if the ML20PLUS-D or the FS-Curtis ML20Plus-SH (20 HP, Simplex) is the better fit? We’ll walk you through it.
A shop buying from a pure e-commerce retailer gets a box. A shop buying from Alamo gets a partner.
Shipping Rates and Delivery Estimates: Shipping is FREE to the 48 contiguous United States.
Shipment Processing Time: All orders are processed within [2–3] business days of receipt, excluding weekends and holidays. Orders are not processed or shipped from Friday at 12 pm CST through Sunday or on holidays. During periods of high order volume, shipments may be delayed by a few days. Customers will be notified via email or phone in the event of significant delays.
See the attached document for FS CURTIS WARRANTY