FS-Curtis ML20+ 240G 20HP(2) Duplex Ultra Pack Air Comp #ML20Plus-DUP
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| Model / Part Number | ML20+ Ultra Pack 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-DUP — 20 HP (x2, Duplex) Air Compressor
The highest-volume manufacturing facilities need both the redundancy of two independent 20 HP pumps and the factory-installed air-quality accessories that keep a large operation running without a maintenance tech manually managing tank drains across a sprawling facility.
The FS-Curtis ML20Plus-DUP is a duplex two-stage reciprocating, ultra pack compressor rated for 20 HP (x2, Duplex) with a 240 gallon horizontal ASME tank, built for multi-bay shops and commercial operations that need compressed air on tap all day. The included Ultra Pack — factory-installed automatic tank drain and refrigerated air dryer — takes the guesswork out of tank maintenance and air quality, freeing up your team's time for actual repair work instead.
Who the ML20Plus-DUP Is Built For
- ✅ A large manufacturing facility running multiple production lines where a compressor outage stops everything at once, and the second pump keeping the line running pays for itself the first time it's needed
- ✅ A high-volume operation where an aging single compressor has already failed mid-production run, costing hours of downtime across the facility
- ✅ A facility that's grown past what a simplex unit can support and needs both maximum combined CFM (158.6) and the uptime insurance of a second pump, plus the factory-installed dryer
- ✅ An operator who's already standardized on FS-Curtis's ML Series at other locations and wants the top Ultra Pack duplex tier for the highest-volume facility in the group
- ✅ A facility manager budgeting for planned production expansion who'd rather buy the headroom and accessories now than upgrade twice
What the ML20Plus-DUP Is NOT Built For
- ❌ Smaller or mid-size facilities — this is the most expensive configuration in the ML20 line and is overkill for lighter demand
- ❌ Budget-conscious buyers — the base ML20PLUS-D duplex without Ultra Pack saves meaningfully if accessories aren't needed yet
- ❌ Facilities with limited floor space — still a large-footprint duplex unit even at the smaller of the two ML20 duplex tank layouts
What Makes the ML20Plus-DUP Different
Commercial 2-Stage Pump
The ML20Plus-DUP 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
The pump is built for 158.6 CFM @ 175 PSI at up to 175 PSI — enough headroom to run impact wrenches, tire equipment, and paint tools through back-to-back jobs without a dip in pressure.
Ultra Pack Upgrades
Includes factory-installed automatic tank drain and refrigerated air dryer — upgrades that reduce maintenance and extend the life of the tank and pump versus a base-model compressor.
Power Requirements
Three-Phase only, 230V/460V options available. Confirm your panel and breaker sizing with an electrician before delivery.
- Redundancy + factory accessories
- 158.6 CFM combined output
- Highest-volume manufacturing facilities
- Smaller / mid-size facilities
- Budget-first buyers
ML20Plus-DUP vs. FS-Curtis ML20PLUS-D (Duplex, no accessories) — Which Compressor Is Right for Your Shop?
| Decision Point | ML20Plus-DUP | FS-Curtis ML20PLUS-D (Duplex, no accessories) |
|---|---|---|
| Horsepower / Tank | 20 HP x2 / 240 Gal Horizontal | 20 HP x2 / 240 Gal Horizontal |
| CFM @ 175 PSI | 158.6 CFM combined | 158.6 CFM combined |
| Redundancy + accessories | Duplex pumps + Ultra Pack bundle (auto-drain/dryer) | Duplex pumps, standard configuration |
| Best fit | Highest-volume facilities wanting redundancy and factory accessories together | Facilities wanting redundancy at a lower price |
Choose the ML20Plus-DUP for the most fully-equipped, redundant setup in the ML20 line. Choose the ML20PLUS-D for the same redundancy at a lower price if you don't need the Ultra Pack accessories. Both stay inside Alamo’s catalog — call (844) 480-6059.
Full Specifications — ML20Plus-DUP
| Model / Part Number | ML20+ Ultra Pack Duplex |
| Horsepower | 20 HP (x2, Duplex) |
| Pump | C98 (x2), Cast-Iron, Two-Stage |
| Configuration | Duplex Two-Stage Reciprocating, Ultra Pack |
| 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 (FML20C98D4U-A9L1XX) |
| Ultra Pack Features | factory-installed automatic tank drain and refrigerated air dryer |
| Overall Dimensions | 105" L x 53" W x 73" H |
| Shipping Weight | 3800 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: 105" L x 53" 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: 3800 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-DUP
FS-Curtis backs the ML20Plus-DUP with a 1-year parts-only warranty.
| Component | Coverage Term |
|---|---|
| Tank & pump | 1 year parts |
| Motor & electrical components | 1 year parts |
| Ultra Pack accessories (auto tank drain, refrigerated air dryer) | 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-DUP
Why Buy the ML20Plus-DUP 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-DUP or the FS-Curtis ML20PLUS-D (Duplex, no accessories) 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