Aquarius Universal Classic Pumps are ideal for small water features because of their low-level suction and ability to draw from shallow water. They come with a manual flow adjustment that can be used to achieve the desired aesthetic. If they are gravity-fed, the Aquarius Universal Classic 1000, 1500 and 2000 can also be mounted outside the pond or water feature.
 
Here are the specifications for each pump:
 
Aquarius Universal Classic 1000: 
width 125mm, depth 80mm, height 75mm 
13/19/25mm (½″/¾"/1″) hose tail
max. flow rate 16 l/min
max. head height 1.5m.
 
Aquarius Universal Classic 1500: 
width 125mm, depth 80mm, height 75mm
13/19/25mm (½″/¾"/1″) hose tail
max. flow rate 25 l/min
max. head height 1.8m.
 
Aquarius Universal Classic 2000: 
width 125mm, depth 80mm, height 75mm
13/19/25mm (½″/¾"/1″) hose tail
max. flow rate 33 l/min
max. head height 2.0m.
 
Aquarius Universal Classic 3000: 
width 245mm, depth 130mm, height 135mm 
25/32/38mm (1″/1¼"/1½″) hose tail
max. flow rate 50 l/min
max. head height 3.2m.