What type of pump switch do you use?

Hi all, just finished putting together a hand carry chem applicator. I followed the advice of a guy over on the window cleaning forum and bought/assembled a RioRand adjustable 12V switch and it fried my second day using the setup.

Now I have to go buy a switch to hook up between my battery and pump.

Any suggestions as to what is the preferred type of on/off switch?

I bought a switch at my local electronics shop rated for double the amp draw of my pump.

Works great.