AP200 This Hugo Kamishi 200 airpump is recommended for aquariums 45 litres – 136 litres It has a single outlet with varaible control It comes complete with a 2m 6mm airline, airstone and check valve   AP400 This Hugo Kamishi 400 airpump is recommended for aquariums 130 litres – 220 litres It has 2 outlets and a varaible control It comes complete with 2 x 2m 6mm airlines , 2 airstones and 2 check valves   AP600 This Hugo 600 airpump has 2 outlets and a variable control it comes complete with 2 x 2m 6mm airline , 2 check valves and 2 airstones We recommend this pump for aquariums of 270L plus   AP80 This great little airpump is a single outlet airpump which we recommend for a 5-10 gallon aquarium (22 – 45 Litres) It comes complete with 2metres of 6mm airline and an airstone and a non return valve