Durco Mark III / Part Identification

Durco Mark III Parts Breakdown & POS Code Finder

Identify the component function first, then verify the installed pump Group, size, exact reference and material before quotation. Built for maintenance and purchasing teams working from a BOM, sectional drawing, nameplate or removed part.

ASME B73.1 platform context POS / component / reference verification Engineering review context retained

Mark III identification evidence OEM reference / revision check

Use the applicable OEM sectional or parts drawing to identify component positions. Send the document revision, pump Group, size and exact reference for verification.

Identify POS from the installed pump’s applicable OEM parts documentation. Verify its model, Group and document revision.

Start from what you already know

Choose the shortest identification path.

POS identifies the component position. Exact purchasing still depends on the installed pump context.

01 / POS CODE

I know the POS number

Identify the component, then verify Group, pump size and exact reference.

02 / OEM REFERENCE

I know the OEM number

Search the exact reference and retain the matched pump context.

03 / POS 103 IMPELLER

I need the Mark III impeller

Verify the reverse-vane POS 103 configuration by Group, size, trim and material.

04 / NAMEPLATE OR PHOTO

I only have a nameplate/photo

Send the pump identity and available part evidence for engineering review.

Interactive data workbench

Find the component, then carry verified data into engineering review.

Use the POS code to identify the component function, then verify the installed pump size/Group, exact reference, material and relevant mating interfaces before any supported quotation.

Durco Mark III · Active Components Lookup

ASME B73.1 CONTEXT

Technical reference only. The supported standalone supply scope is casing, cover, impeller, shaft and selected metallic mechanical-seal components / metallic parts made to an approved drawing. Exact item supply must be confirmed separately; POS codes and functional labels do not create quote items. Bearings, bearing housings/carriers, seals and other components remain reference-only.

POS ID	Component	Verification focus	Reference context	Action
POS 100	Casing	Confirm Group, pump size and configuration-specific interfaces before release.	Technical reference only — exact supply unconfirmedVerify exact reference and material before ordering
POS 103	Impeller	Confirm Group, pump size and configuration-specific interfaces before release.	Technical reference only — exact supply unconfirmedVerify exact reference and material before ordering	Verify POS 103 reverse-vane impeller
POS 104	Impeller Gasket	Confirm Group, pump size and configuration-specific interfaces before release.	Technical reference onlyVerify exact reference and material before ordering
POS 105	Shaft	Confirm Group, pump size and configuration-specific interfaces before release.	Technical reference only — exact supply unconfirmedVerify exact reference and material before ordering
POS 106	Rear Cover Plate	Confirm Group, pump size and configuration-specific interfaces before release.	Technical reference only — exact supply unconfirmedVerify exact reference and material before ordering
POS 107	Rear Cover Gasket	Confirm Group, pump size and configuration-specific interfaces before release.	Technical reference onlyVerify exact reference and material before ordering
POS 108	Bearing Housing Adapter	Confirm Group, pump size and configuration-specific interfaces before release.	Technical reference onlyVerify exact reference and material before ordering
POS 109	Bearing Housing Foot	Confirm Group, pump size and configuration-specific interfaces before release.	Technical reference onlyVerify exact reference and material before ordering
POS 109A	Shim	Confirm Group, pump size and configuration-specific interfaces before release.	Technical reference onlyVerify exact reference and material before ordering
POS 118	Oil Seal Inboard	Confirm Group, pump size and configuration-specific interfaces before release.	Technical reference onlyVerify exact reference and material before ordering
POS 119	Bearing Housing	Confirm Group, pump size and configuration-specific interfaces before release.	Technical reference onlyVerify exact reference and material before ordering
POS 120	Bearing Inboard	Confirm Group, pump size and configuration-specific interfaces before release.	Technical reference onlyVerify exact reference and material before ordering
POS 121	Bearing Outboard	Confirm Group, pump size and configuration-specific interfaces before release.	Technical reference onlyVerify exact reference and material before ordering
POS 129	Oil Seal Outboard	Confirm Group, pump size and configuration-specific interfaces before release.	Technical reference onlyVerify exact reference and material before ordering
POS 130	Key — Shaft/Coupling	Confirm Group, pump size and configuration-specific interfaces before release.	Technical reference onlyVerify exact reference and material before ordering
POS 153	Mechanical Seal	Confirm Group, pump size and configuration-specific interfaces before release.	Technical reference onlyVerify exact reference and material before ordering
POS 177	Hook Sleeve	Confirm Group, pump size and configuration-specific interfaces before release.	Technical reference onlyVerify exact reference and material before ordering
POS 190	Gland — Mechanical Seal	Confirm Group, pump size and configuration-specific interfaces before release.	Technical reference onlyVerify exact reference and material before ordering
POS 200	Sight Gauge	Confirm Group, pump size and configuration-specific interfaces before release.	Technical reference onlyVerify exact reference and material before ordering
POS 201	Bearing Carrier	Confirm Group, pump size and configuration-specific interfaces before release.	Technical reference onlyVerify exact reference and material before ordering

Selected technical reference: Pending selection

Contact Engineering Support →

Engineering proof

Use the POS code as a location reference—not the entire fitment decision.

Use the applicable OEM parts documentation to locate the POS reference, then confirm the installed pump context and exact part reference before ordering.

Component relationship · simplified schematic

Use the applicable OEM sectional or parts drawing to identify component positions. Send the document revision, pump Group, size and exact reference for verification.

Identify the component position

POS narrows the function in the assembly and gives purchasing a common reference point.

Confirm the installed pump context

Group, pump size, OEM reference, material and the relevant mating interfaces remain part of the fitment review.

Carry verified context into the quotation

Your selected component details stay with the engineering review, so the same identification data does not need to be entered again.

Official supply categories

Review the approved metallic supply scope.

A category match or POS reference does not confirm item availability. Confirm the exact part and configuration separately.

Casings & Covers Pump casings and covers

Exact casing and cover items require separate supply confirmation. Bearing housings and seal chambers are not included by name similarity.

ANSI Pump Impellers Impellers

Impeller requests need engineering review. No POS/OEM row on this page is individually fitment-verified or availability-confirmed.

Shafts Exact shaft configuration

Confirm the shaft dimensions, mating interfaces and material. Hook sleeves and other unlisted items remain technical references only.

Selected metallic seal components Approved drawing / configuration review

Review only the selected metallic component against its drawing and material. Ordinary nonmetallic seals and unlisted accessories are outside the standalone supply scope.

Fitment First Before quotation release

Pump identity, exact reference and material remain part of the engineering verification record.

Continue the Durco Mark III route

Move from part identification to the next buying task.

02 / FITMENT

Verify a Reverse-Vane Impeller

Use Group, size, POS 103 and the OEM/replacement reference to narrow fitment.

Verify POS 103 reverse-vane impeller →

03 / OEM LOOKUP

Search OEM Part Number

Check the exact OEM or replacement reference and matched pump context.

Search OEM part number →

04 / CATEGORY

Browse ANSI Replacement Impellers

Choose the verified model-specific replacement impeller route.

Browse replacement impellers →

Buyer questions

Durco Mark III parts identification FAQ

What does a Durco Mark III POS code identify?

A POS code identifies a component position or function in the applicable parts documentation. It is a starting point for identification, not a complete fitment approval by itself.

Is the POS code enough to order a replacement part?

No. Confirm the installed pump model or size/Group, exact OEM or replacement reference where available, required material and the relevant mating interfaces before release.

What if I only have an OEM part number?

Use the OEM part-number cross-reference route. The exact reference can then be checked against the installed pump context and carried into the quotation request.

What if I do not know the Mark III Group?

Send the pump nameplate, size, drawing or clear photographs. These can be used to determine which additional identifiers must be confirmed.

Can I send a removed-part photo or sectional drawing?

Yes. A nameplate, parts list, sectional drawing and clear component photographs can materially improve the identification review.

Independent aftermarket notice. ANSI Pumps Pro is an independent aftermarket manufacturer and supplier. Durco, Flowserve, Goulds and related model names and part references are used solely for identification and cross-reference purposes. No OEM affiliation, authorization or sponsorship is implied.