1.  This is a great air stone- it makes a super-fine bubble stream. The air stone release air bubbles smaller, denser, more uniform,help fish swim happily in aquarium,fish tank,koi pond.
2. Air stone is heavy enough to stay at the bottom and the air stone does not float up.Another advantage is the air pump court is on the side so it’s not right in the middle so fish can swim over the bubbles without running into the plastic line.
3. This aquarium bubbler will diffuse air into the tank in a gradual manner and pushes tons of oxygen.quieter than other types with large bubbles tends to cover the noise from the air pump.
4. the 2.1″(7cm) airstone is compatible with 4mm airline tube. Please NOTE the deeper you put the air stone under water, you may need use a larger wattage air pump to drive air stone.
5. Packing:1 x air stone,1 x regulating valves, 1 x check valves, 2 x suction cups. Please noted the air tube and oxygen pump is not including.

1: Do you are factory or only company?
We have factory to produce aquariums accessories.

2: Why we can choose you?
1): Reliable—we are the real company, we dedicate in win-win
2): Professional—we offer the accessories of aquariums exactly you want
3): Factory—we are a factory, we offer high quality and best price.

3: How about the shipping cost?
If your goods is not large, we can send goods to you via counier, such as FEDEX, DHL,we cooperated with them for long time, so we have good price.If your goods is large, we will send to you via sea, we can quote the price to you, then you can choose whether use our forwarder or yours.

4:How about the price?Can you make it cheaper?
The price depends on the item your demand(Shape,size,quantity)
Beat quotation after receving full description of the item you want.

5:How about the sample time?What is the payment?
Sample time:about 3~7days after order & samples confirmed.
T/T,30% deposit, and balance is after the order is finished. Also we accept the west union or moneygram or through by trade assurance in Alibaba.