ra Precision Air 110 Plus Air Pump (110 l/h) Sera air pumps are amongst the most silent pumps in their category. The 110 R Plus has a durable diaphragm with provide a free airflow output of 110 l/h. It's suitable to drive internal filters (sponge, box or undergravel type), plancton cultures, external breeding boxes or air-driven decoration. The inside machinery is completely detachable which makes perodical cleaning easy as well as part substitution. There are available spare parts for pumping chamber, diaphragm and air filter. Includes a security check valve. Sera Precision Air 275 R Plus Air Pump (275 l/h) Air pump for small and medium-sized aquariums - electronic adjustment. 275 l/h, 4 W, AC 220 – 240 V ~ 50/60 Hz, TÜV, GS, CE 2 powerful independent membranes. For air driven decoration elements, aquarium and pond devices (e.g. sera internal filter L). Sera Precision Air 550 R Plus Air Pump (550 l/h) Air pump for medium-sized, large aquariums and ponds - electronic adjustment. 550 l/h, 8 W, AC 220 – 240 V ~ 50/60 Hz, TÜV, GS, CE 4 powerful independent membranes. For air driven decoration elements, aquarium and pond devices (e.g. sera internal filter L). We also have the air sets listed in the drop down menu in 3 different sizes - Set S Small 2m air line 1x air control valve 1x non return valve 1x 25mm air ball stone Set M Medium 4m air line 1x air control valve 2x non return valve 2x 25mm air ball stones Set L Large 10m air line 1x 50mm air ball stone