Hello, I am just about done with my new tank set up and received a new rheostat 500 deluxe in the mail. It has a double outlet, but neither has a 3 prong hole outlet on it. The new undertank pad i received has a 3 prong plug, is it ok to get a 3 prong adapter to get them to match up ?? As soon as I get it all set up I will try to upload some pictures, have a digital camera so I am hoping it's not too difficult. Thanks