West System 301 Mini Pumps Designed for convenient and accurate dispensing of West System 105 Resin and 205/206 Hardeners. One full compression of each pump will give you the correct 5:1 ratio required. Prior to using, ensure that both pumps are properly primed to prevent off-ratio mixes.
WARNING: DO NOT USE WITH 207 OR 209 HARDENERS!
 
West System 303 Special Ratio Mini Pumps Designed for convenient and accurate dispensing of West System 105 Resin and 207/209 Hardeners. One full compression of each pump will give you the correct 3:1 ratio required. Prior to using, ensure that both pumps are properly primed to prevent off-ratio mixes.
WARNING: DO NOT USE WITH 205 OR 206 HARDENERS!