When a chemical process line needs a centrifugal pump, the first decision usually comes down to two things: material compatibility and budget. Two new-open-box Durco/Flowserve pumps sit on opposite ends of that trade-off. The Durco MK II 4x3x10 is a 316SS pump with an 8.750" impeller and clockwise rotation, listed at $5,750. The 3" x 2" Durco Flowserve MK3 STD is a DCI chemical process pump rated at 250 PSI @ 100°F, listed at $2,750. Both are open-box, but they serve different process conditions.
Quick Verdict
If your line needs a larger 316SS pump with a specific 8.750" impeller and clockwise rotation, the Durco MK II 4x3x10 is the pump to focus on. If you want a compact 3x2 DCI process pump with a 250 PSI rating at 100°F and a $3,000 lower listed price, the Durco Flowserve MK3 STD is the more economical pick. The right choice depends on whether material compatibility or price ceiling drives your purchase.
At a Glance
| Product | Condition | Key Material / Specs | Listed Price | Price Bar |
|---|---|---|---|---|
| Durco MK II 4x3x10 Centrifugal Pump 316SS | New - Open box | 316SS, 8.750" impeller, CW rotation, MPN MKII | USD 5,750.00 | |
| 3" x 2" Durco Flowserve MK3 STD Chemical Process DCI Pump | New - Open box | DCI, 250 PSI @ 100°F, model MK3 STD, MPN MK3 STD | USD 2,750.00 |
The listed price difference is $3,000. That's a large enough spread to make the MK3 STD attractive for projects with a tighter budget, but the MK II brings 316SS construction and a specific impeller size to the table.
Where Each Product Wins
Durco MK II 4x3x10 wins if you need 316SS construction, a 4x3x10 size format, and the 8.750" impeller spec. It's also the pump with explicit interchange to the Durco/DXP MK II 4x3-10 ANSI process pump.
3" x 2" Durco Flowserve MK3 STD wins if you're working with a 3x2 footprint, want a DCI chemical process pump, and want the lower listed price. The 250 PSI rating at 100°F is a clear spec for service conditions.
Product Notes
Durco MK II 4x3x10 Centrifugal Pump 316SS, 8.750" Impeller, CW Rotation
At $5,750, this is the higher-priced pump in the comparison. It's a 4x3x10 MK II rebuilt/tagged by Total Equipment Company (TEC #21148, dated 03/24). The 316SS construction and 8.750" impeller are the headline specs, and rotation is clockwise. It's listed as New - Open box with MPN MKII. The main limitation for a buyer is that the pump is the only component included; no motor or baseplate is part of this unit. If you already have a suitable motor and baseplate, that's fine, but if not, those components add to the overall project cost.
3" x 2" Durco Flowserve MK3 STD Chemical Process DCI Centrifugal Pump NEW Z1
At $2,750, the MK3 STD is $3,000 less than the MK II. It's a 3" x 2" model MK3 STD with size 2K3X2-82RV, rated at 250 PSI @ 100°F, and made of DCI. The manufacture date is 2018, and it weighs 315 lbs. It's new-open-box surplus from Bitter End Trading in Springfield, NH. The pump is the item being offered, and the listing shows only what appears in the photos. As a surplus unit, you're buying on the stated specifications and visible condition rather than any test procedure.
Final Choice by Use Case
Choose the Durco MK II 4x3x10 when your process line requires a 316SS pump with a precise 8.750" impeller and clockwise rotation, and you have the budget for the $5,750 listed price. The 4x3x10 size gives you a larger pump platform.
Choose the 3" x 2" Durco Flowserve MK3 STD when a 3x2 DCI pump with a 250 PSI rating at 100°F meets your process conditions and you want to keep pump cost at $2,750. The $3,000 difference between the two listed prices can go toward other project components like a motor, baseplate, or piping.
If the material spec is your priority, the 316SS MK II gives you stainless-steel construction; the MK3 STD is the DCI process pump. If price is your priority, the MK3 STD is the clear pick.
