
I bought this hose to connect an air pump to an inexpensive Tetra brand filter. I had a little trouble getting it to the air pump, but it was very difficult to attach to the filter. Admittedly, the hose on the filter that the line should attach to is actually too big to fit in a standard aquarium hose. In fact, this filter tube has the same outside diameter as this PennPlax tube. I didn't expect this to be a big problem as I often run smaller hoses over the brew fittings. A little warm water or a little stretching of the nail is usually enough, but this tube is so thin-walled that even after a little stretching, there isn't enough stiffness to push through the tube without breaking. still enough flexibility to curl it around the tube. Finally I put it on. Hardly. And a little torn. I went to PetSmart and bought a brand I had never heard of that had noticeably thicker walls and better flexibility. I brought it home and easily attached it to the pump, check valve and filter.

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