Hi Nan .. home depot does have water pumps of all sizes .. meaning output .. the 1/2" is for the connection portion of the pump .. pretty much any pump should fit .. if not there are fittinngs which will enable you to fit it .. the main thing you need is to find the pump size to fit .. do this by looking at the old pump and get the manufacturer and model # of the old pump .. a sales rep would help you match the size correctly .. if you have the old pump disconnected bring it with you to make sure it is correct .. if you can't find at the HD .. you can check Lowes .. if it is a weekend project you need to get one on weekday to make sure you have what you need for the weekend .. nothing like starting a project and not having what you need on site .. hope this helps you. .. if so CLICK LIKE below so i can HELP others .. THANKS and GOOD LUCK
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