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THOMSEN MILK PUMP SEAL

SKU

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As low as $39.95

Size

Seal

Material

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Overview

Pump	Internal		External
	Buna	Viton	Buna	Viton
#4	9355BO	9355VO	9222BO	9222VO
#5	9356BO	9356VO	9223BO	9223VO
#6	9357BO	9357VO	9224BO	9224VO
#8	9359BO	9359VO	9499BO	9499VO

Details

Thomsen Milk Pump Seal Kits — Internal & External

Complete seal kits for Thomsen centrifugal milk pumps in models #4, #5, #6, and #8. Choose between internal or external seal designs, with material options in Buna (BO) or Viton (VO).

Material Options — Buna vs. Viton

Buna (BO): Economical, reliable, widely used for standard dairy wash systems.
Viton (VO): Higher chemical and heat resistance, recommended for harsher CIP systems and extended service life.

Always match your seal kit material to your cleaning chemicals and temperature profile.

Pump Compatibility

Model #4 — Internal or External seal kits
Model #5 — Internal or External seal kits
Model #6 — Internal or External seal kits
Model #8 — Internal or External seal kits

Unsure which you need? Check our Back Plate page or compare your pump to the diagrams in the Visual Guide below.

Internal vs External — Visual Guide

Thomsen Pump — Internal Seal breakdown diagram — **Internal Seal** — Seal components sit *inside* the pump housing behind the back plate.

Thomsen Pump — External Seal breakdown diagram — **External Seal** — Seal assembly is positioned *outside* the pump housing.

What’s Included in Each Kit

Head O-ring
Ceramic seal face
Carbon seal face with spring
Impeller clips (and hardware as required)

Each kit contains all parts needed to rebuild and reseal your pump.

Cross Reference Numbers

Pump	Internal — Buna	Internal — Viton	External — Buna	External — Viton
#4	9355BO	9355VO	9222BO	9222VO
#5	9356BO	9356VO	9223BO	9223VO
#6	9357BO	9357VO	9224BO	9224VO
#8	9359BO	9359VO	9499BO	9499VO

Related Parts

Back Plate for Thomsen Pump — match internal or external style
Shaft — replacement pump shaft
O-Ring — replace during seal service to prevent leaks
Clamp — sanitary clamp used on dairy piping
Complete Thomsen Pumps — ready-to-install assemblies
Pump Housing (Head Only) — replacement pump head
Impeller — replace if worn or damaged