The advanced TetraTec APS 400 Air pump is for use with all aquaria from 250 to 600 litres in size. With the external flow control valves included, the TetraTec APS 400 can be easily adjusted to provide the right air flow for all purposes like box filters, airstones, action ornaments and undergravel filters.https://www.aquaristikshop.com/aquaristic/TetraTec-APS-400/118133/
- conrad m. wrote about TetraTec APS 400 in 2015:
This pump is very silent and is very power full. I am very satisfied with it and surely will buy another one.
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