good quailty check valve. A must have if you use an external air pump to run your filter or in my case, air stones. The valve prevents water from back filling the tubing and ruining your pump.

Pros: prevents water back up into air pump

Cons: none if used properly

If you are using an air pump type filter system. or just running air stones. this is a must have product. it keeps the water from backing up, and draining out, or killing the pump

Pros: good

Cons: none

This product is really easy to use and I've used it on two different types of air pumps and it worked great. If you are using any type of air pump I recommend this product.

Pros: works great

Cons: none

I have used these for years without any problems or complaints.

Pros: durable

Cons: none

We use this with our 55 gallon tank and it really helps keep the air filters running with no problem.

Pros: keeps your fishtank running without pebbles cloggiging the system

Cons: it costs like anything else