@Mannyrock posted:Does this mean I can hook this up directly to my little train transformer, with 7.5 amps, and set it on 12 volts without burning out the pump? Who knows? Can hair thin wires handle 7.5 amps? Who knows?
Electrical devices only draw the power required, they're not dependent on the current capacity of the supply voltage source. If that were not the case, every time you plugged a nightlight into a 15A household circuit, it would immediately blow up in your hand. 
If this accessory requires 100ma and you connect it to a 7.5A transformer, it'll draw 100ma.
