303 Pump rate 3: 1

Intended for West System 207 and 209 Special tropical hardener. The mini-pumps are screwed directly onto the base and hardener tanks, respectively, and are calibrated to provide three parts by weight of base to one part by weight of hardener with one pump stroke from each pump. See Dosing with mini-pumps. A full pump stroke with each pump provides about 25 g of base and about 8.5 g of hardener. Warning: never use with 205 or 206 Hardener.