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WEST SYSTEM 303 Special Ratio Mini Pumps

These pumps are specially designed for convenient and accurate dispensing of mixtures of WEST SYSTEM 105 Epoxy Resin® and 207 Special Clear Hardener or 209 Extra Slow Hardener.

The 303 Special Ratio Mini Pumps mount directly on the resin and hardener containers and have been calibrated to deliver the correct working ratio of 3.5 parts by weight of resin to 1 part by weight of hardener with one stroke from each pump.

Warning: do not use 303 Special Ratio Mini Pumps with 205 Fast Hardener® or 206 Slow Hardener®.

If you are using 105 Epoxy Resin with 207 Special Coating Hardener or 209 Extra Slow Hardener:

  • use the 303A set (3:1 by volume) to fit the A Pack size
  • use the 303B set (3:1 by volume) to fit the B Pack size
  • use the 303C set (3:1 by volume) to fit the C Pack size

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Dispensing and mixing guidance
Careful measuring of resin and hardener and thorough mixing of the two components are essential for a proper cure. Full guidance about dispensing and mixing can be found here.

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