The West System 303 Pump Kit was designed for convenient and accurate metering of West System resin and hardeners.
For convenience, the pumps mount directly onto both the Resin and Hardener containers. This eliminate the mess involved with measuring by weight or volume.
Calibrated to deliver the correct working ratio of 3 parts of 105 resin to 1 part of either 207 Special Coating or 209 Super Slow hardeners. With one full pump stroke of resin for each one full pump stroke of hardener. For 5:1 ratio, see the 301 Kit.