HSC12B

They worked really well, the suction on them is awesome. Holds what needs to be held in place quite nice. They are very easy tu put on and off. Nice quality and durable.

These worked great to replace old clips that were falling apart after some years underwater. Fit the heater perfectly.

I am using these to adhere mounted orchids to the walls of a glass vivarium. They work pretty well, though the clips are a little larger than I was expecting and are not adjustable. You can, however, string some wire through small holes on the clips and use that to adhere anything to the cups. So far, they work fairly well. I would guess that if you are using them exclusively for the stated purpose of holding aquarium heaters, they are a five star product. If you're in need of some black suction cups for a different application, these will likely work but might take some creativity.

Very useful in aquarium fish hobby. Great for holding intake canister filter in place. Many uses for all your aquarium needs. I recommend this product for purchase.

I'm very glad I picked these up! I use them for my 300w Ehim heater, after the old ones hardened and stopped sticking. These stick well, and fit the heater perfectly. No weird smell or residue, I just rinsed two off, popped them on, and was all set. I've been using my first two for several months now, and my heater is still firmly attached. Great value, and the design of the holder is easy to use and sturdy.

I have been using this suction cups for a while and they stay in place as needed. The right size and good value. I would buy it again!

Works perfectly fine for my Fluval 307 intake tube. 0.67”

Some are malformed and it affected the suction power. The ones that are not are great. Just fyi, you may get a dud or 2 in the box.

Acceptable product.

Quick delivery. These are well made and work perfectly. They are great value when in bought in bulk like this 12 pack. I'm using them to hold a portable solar panel in place and they work well.

Great replacement suction cups for old hardened ones that no longer work, however these do break down over time. The rubber decays leaving your fingers black and the particulate will contaminate your aquarium, possibly poisoning or consumed by costly curious fish. Be aware that this will happen! It's hard to believe these were still holding on. They were submerged hidden behind a filter tube inside my 100 gallon aquarium (out of view behind an aquascape for over a year). I would suggest not leaving them uninspected and to replace upon any signs of rot/or black smudge on your fingers. I am looking to source silicone cups in hopes they last without breaking down. Until I find a good source, I will continue to use these but replace more frequently to avoid contaminating my tank. I have been using these in a fresh water aquarium kept at 76F, so I cannot comment on how salt or brackish water, or higher temperatures would affect their longevity.

Works well with my heater.

These are well made and will be useful for various tasks. Thank You