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Graco 104203 Vee Block Seal

The Graco 104203 Vee Block Seal (104-203) is a polyurethane V-profile seal that maintains pressure and prevents bypass in V-block/piston stacks on select Graco foam & polyurea units.

  • Fits: Graco H-25, H-30, H-40, H-50, H-XP2, H-XP3
  • Size (typ.): ID ~65 mm, OD ~80 mm, Thick. ~8 mm — confirm with your manual
  • Material: Polyurethane • Use: V-block / pump or hydraulic assemblies
  • Note: Generally not used on Magnum / Ultra Max paint sprayers

Retail Price: $149.5
You save: $5.97 (3.99%)
Our Price: $143.53
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Compatibility & Fitment Overview

Compatible Machines

The Graco 104203 Vee Block Seal is commonly used in the following spray foam / polyurea units:

  • Graco H-25
  • Graco H-30
  • Graco H-40
  • Graco H-50
  • Graco H-XP2
  • Graco H-XP3

What This Part Is

The Graco 104203 Vee Block Seal (also seen as 104-203) is a polyurethane V-profile seal used in V-block housings to maintain pressure and prevent fluid bypass in pump/hydraulic sections of select Graco foam & polyurea machines.

Key Specifications

Manufacturer / Part Graco / 104203 (104-203)
Seal Type Vee (V-Block) Seal
Material Polyurethane
Approx. Dimensions ID ~ 65 mm  |  OD ~ 80 mm  |  Thickness ~ 8 mm
Typical Location V-block / piston-seal stack in pump or hydraulic assemblies

Applications & Fitment Notes

  • Designed for Graco spray foam / polyurea systems listed above; not typically used on Magnum/Ultra Max paint sprayers.
  • Match by part number (104203) and by your machine’s assembly diagram for guaranteed fit.
  • Replace as a set if your V-stack uses multiple rings to maintain proper preload and sealing.

Frequently Asked Questions

 

It is supplied as the individual V-block seal. Some assemblies use multiple V-rings and spacers to achieve the correct preload. Follow your machine’s service drawing when rebuilding the stack and replace any worn elements together.

Loss of pressure, fluid bypass, visible wear or nicks on the sealing lip, chemical swelling, or hardening are all signs the Vee Block Seal should be replaced. Inspect mating surfaces and replace any damaged spacers or glands at the same time.

Depressurize equipment, clean the gland, lightly lubricate compatible elastomers, and orient the V-lip correctly per the diagram. Torque fasteners to spec and perform a pressure/leak check after reassembly.

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