This adapter is not all that is needed to couple two different sized tubing together, but its a start. We have a Beckett pump for our small pond. The inside diameter of the tubing that goes with this pump is 1/2". After a few months, I wanted to add on a UV clarifier. In retrospect, I wish I'd just gone with a pump that had a UV light as part of the setup, but, I didn't. (Nice to know though, if you're in the decision making stage. ) After a LOT of dithering, I settled on the TetraPond GreenFree UV Clarifier. (5 Volt light, Designed for ponds up to 660-gallon, includes fittings for tubing 3/4-inch, 1-inch, and 1-1/4-inch) I just assumed (don't assume!) that I could easily find a tubing adapter by either TetraPond or by Beckett. No, I spoke with customer service for these companies, and they do not have what I needed to connect my 1/2" tubing from the pump to the UV clarifier that has a minimum size of 3/4" and goes up to 1-1/4". This Laguna Multi Hose adapter is the ONLY thing that I could locate to attempt to get the UV clarifier hooked up to my pump. In and of itself, it was not enough though. Yes, I could connect tubing, but no, absolutely not a watertight or even secure connection. On the end connecting it to the UV light, it was hard plastic fitting into hard plastic, and no way just adding a clamp to it would make any difference, because a clamp isn't going to have any effect on rigid plastic fittings. On the smaller end, a clamp is enough to attach the adapter securely to the water pump tubing, but, you still have to have a clamp. Just sliding the tubing onto it isn't enough to keep it in place. I finally went to the local ACE hardware store, and the guy there was really helpful. He cut two pieces of rubber hose (like 4 linear inches each) that fit the 1" connector part of the UV Clarifier, A clamp went there, onto that hose, to hold it securely in place onto the UV Clarifier valve. Then, this Laguna Multi Hose adapter went into the other end of the hardware store hose, and a clamp goes onto that end. After that, the tubing from the pond pump goes into the other end of the adapter, and another clamp. So, in total, if you're connecting something similar to what I was doing, there is an intake and output valve. Therefore that makes two adapters needed. If you're connecting this adapter to something that is made of hard plastic (this adapter is also hard plastic) then you will need two short lengths of flexible tubing so that a clamp will be effective, and then you will need three clamps per section you are coupling together. For my project, I needed to have tubing from my pump run to the UV light, and from the UV light back into the pond (waterfall) I bought a total of two Laguna Multi Hose Adapters, 6 hose clamps (in two different sizes) and two short lengths of rubber hose. And, it works perfectly, tubing coming from pond pump is clamped onto adapter, adapter is clamped into larger diameter short section of rubber hose, and that rubber hose is clamped onto the UV Clarifier. Then, out the output side of the clarifier, its the rubber hose clamped onto it, then the Laguna adapter clamped intothe rubber hose, and then the tubing from my pond clamped onto the adapter. If you are connecting two pieces of flexible tubing that are of different sizes, you would only need two clamps. (and one adapter) The need for the extra rubber hose was because there was no way to fit this adapter securely into a rigid plastic receptacle, it is not watertight, there are no rubber gaskets included, and it does not snap or screw into place. ] Once you determine where your connection will take place on the length of this adapter, you can cut part of the smaller end off of it so that it doesn't restrict water flow. It was not difficult to cut with garden pruning shears. I hope this helps.
