GROUP I · 1K
Compact process duties
Typical sizes: 1K 1.5×1LF-4 to 1K 3×1.5-8.Max impeller: 6–8 in · shaft centre: 17.5 in (445 mm).
DURCO MARK III / PARTS HUB
Find the right
path to the part.
A starting point for Durco Mark III replacement parts, Group identification and engineering resources. Choose the route that matches the information you have.
MARK IIIENGINEERING
REFERENCE HUB
REFERENCE HUB
- GROUP I–III
- Configuration pathways
- 6
- Core part families
- 1
- Dedicated MK3 STD POS page
01 / SELECT YOUR PATH
Start from what
you can identify.
This hub prevents a broad search from turning into an incorrect part order. Each path leads to the correct next page—not the same generic RFQ.
01MK3 STD parts
Identify your
Browse by
Read an
MK3 STD parts
by POS code
Have an OEM part number, POS code or parts list? Go directly to the detailed procurement page.
Open MK3 STD parts page ↗02Identify your
Mark III Group
Use Group I, II or III to frame the casing, impeller and power-end interfaces.
Compare Groups ↓03Browse by
part family
Start from an impeller, casing, seal chamber or shaft assembly.
View part families ↓04Read an
engineering guide
Understand reverse vanes, interchangeability and materials before specifying.
Browse guides ↓02 / GROUP IDENTIFICATION
Group is the
first filter.
It is not a product range or a quality tier. It is the key that connects pump size with the matching mechanical interfaces.
Max impeller: 6–8 in · shaft centre: 17.5 in (445 mm).
GROUP II · 2K
Core process range
Typical sizes: 2K 2×1-10A to 2K 6×4-10H.Max impeller: 10–13 in · shaft centre: 23.5 in (597 mm).
GROUP III · 3K
High-capacity service
Typical sizes: 3K 3×1.5-13 to 3K 10×8-17.Max impeller: 14–17 in · shaft centre: 33.875 in (860 mm).
ENGINEERING BASELINE
The facts that stay
with the part.
These are the selection and verification essentials from the original Mark III resource. The detailed POS table and RFQ now live on the dedicated MK3 STD page.
Material range, not a shortcut.
CF8M, WCB, CD4MCu, CN7M, Monel 400, Nickel 200, Hastelloy B/C and Titanium are available subject to the service review.
Review material guide ↗Evidence before shipment.
CMM dimensional inspection · dynamic balance · hydrostatic pressure test · fit-testing · PMI/XRF · EN 10204 3.1 MTR.
Discuss documentation ↗03 / PART FAMILIES
Browse the component
that starts the job.
01
Impellers
Reverse vane, hydraulic fit and wet-end alloy selection.
Request impeller →02Casings
Pressure-containing wet-end castings across Group I–III.
Request casing →03Seal chambers
Rear covers, glands and mechanical-seal interfaces.
Request seal chamber →04Shafts & sleeves
Group-specific shaft and sleeve combinations.
Request shaft set →05Bearing housings
Power-end housings, feet and adapters.
Request housing →06Gaskets & O-rings
Common fast-turn items and service-specific elastomers.
Request seals →04 / ENGINEERING GUIDES
Use the right
reference before RFQ.
These guides answer specification questions. They do not duplicate the detailed MK3 STD parts-page tables.
01
INTERCHANGEABILITYDurco Mark III vs Goulds 3196: what actually matches?
Read article ↗02HYDRAULICSWhy reverse vane impellers protect the seal chamber
Read article ↗03PART IDENTIFICATIONHow to read Mark III POS codes and Group references
Open POS guide ↗04MATERIALSChoosing an alloy for corrosive chemical process service
Open material guide ↗NEXT STEP / MK3 STD
Already have a POS code
or exact pump reference?
Use the dedicated MK3 STD Parts page for POS codes, supply options, materials, delivery planning and an engineer-reviewed RFQ.
ENGINEERING CONTACT
Not sure where
to begin?
Send a nameplate photo, part number or parts list. We will identify the correct Group and next technical step.
[email protected] ↗- 01Send your available referencePart number, pump size, drawing or photo.
- 02We confirm the routeGroup, interface, material and documentation needs.
- 03Receive the right RFQ pathDetailed MK3 STD quote or broader engineering support.