I am having the same problem hooking up my dishwasher. I can not seem to find different types of adaptors.

Question

I bought the adaptor, however when I hook it on and turn on the water it pops off.

Answer 1

It would help if you described the kind of connection you are asking about.  

Is this a portable dishwasher that you are trying to adapt to a faucet?  If so, they typically use a quick-release connection, and they can vary from one manufacturer to the next.  You would need to get the exact adapter for your make and model of dishwasher.    The wrong one might look right and it might even fit together.  

Or is it a built-in dishwasher and you are trying to connect it to the shut off under the sink?