Quiet reliability, compact design, powerful output, unique carbon air filters. All Aqua Airs use neoprene diaphragms for improved durability. Aqua Air Mini with FREE Airline & Airstone Small pump, high flow rateIdeal for small aquariums & bowlsPower filters in aquariums up to approx. 46cmSize of Airwall – 1 x 1” AirstoneMaximum no. of other features x 1*Air Flow(L/hr) – 60Pressure(mbar) – 0.18 AP1 & AP2 Aquarium Air Pump Small pump, high flow rateIdeal for filters, ornaments & airwallsPower filters in aquariums up to: (approx) Model AP1: 60cm Model AP2 :100cmSize of Airwall Model AP1: 1 x 12” Airwall Model AP2: 1 x 18” AirwallMaximum no. of other features Model AP1: 2* Model AP2: 4*Air Flow(L/hr) Model AP1: 120 Model AP2: 210Pressure(mbar) Model AP1: 0.20 Model AP2: 0.17 AP3 & AP4 Aquarium Air Pump Twin OutletReliable performanceHigh Flow rate & High pressure outputIdeal for filters, ornaments & airwallsPower filters in aquariums up to: (approx) Model AP3: 120cm Model AP4: 150cmSize of Airwall Model AP3: 2 x 18” Airwall Model AP4: 4 x 12” AirwallMaximum no. of other features Model AP3: 6* Model AP4: 8*Air Flow(L/hr) Model AP3: 2 x 180 Model AP4: 2 x 300Pressure(mbar) Model AP3: 0.19 Model AP4: 0.19 *Other air features i.e. air stone, ornaments and supplementary air powered filters