JKA is pleased to announce the addition of NEPTUNE: JKA is pleased to announce the addition of NEPTUNE to our World Class line-up of pumping products. NEPTUNE manufactures an impressive line of motor driven metering pumps with capacities up to 300 GPH and pressures up to 4000 PSI. In addition, the NEPTUNE line includes electronic metering pumps, motor & air driven mixers, and a wide array of accessories targeted at the water treatment market.