Designed for convenient and accurate metering of the A-Pack, the 300 Mini Pump Set contains one resin pump and two hardener pumps. Pumps mount directly on the resin and hardener containers and eliminate the mess involved with measuring by weight or volume. 300 Mini Pumps are calibrated to deliver the proper working ratio with one full pump stroke of resin for each one full pump stroke of hardener.  Made of durable polypropylene, the Mini Pumps give years of dependable service. Read and follow the priming, ratio verification and operating instructions that come with the pumps.