The AquaClear A1390 is the correct replacement for the following system:
The AquaClear 20 Foam Filter Insert helps to trap particles and debris that could cloud the water in your aquarium. This replacement foam insert, manufactured by Hagen is also known as part number A1390. It comes in an economical 3-pack value set.
AquaClear 20 Water Pump Foam Filter Specifications:
This filter foam insert is ideal for aquariums that hold between 5 to 20 gallons of water. The tailor fit construction prevents bypass and offers powerful biological filtration.