How to switch 12V water pump
I see people are recommending mosfets (which is the best option). Keep reading this if you still want to use relay. There are two kind of relays, mechanical and solid state. Mechanicals are cheap but they can be noisy (they make sound) also they have low life expectancy compared to solid state relays. On the other hand solid state relays are faster with everything else but they are expensive. Also you need to check voltage and max current rates before buying.