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 (817) 865-3707.
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 (817) 865-3707 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 (817) 865-3707 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 (817) 865-3707 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 (817) 865-3707 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.
- Ships by freight. Add to cart and enter your ZIP for a freight quote, or call us.
- 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.
Your LTL freight rate is calculated at checkout. Each order may contain one lift or other freight-shipped item. Please order parts and additional freight items separately.
See the attached document for FS CURTIS WARRANTY