It never fails. Your pump or filter stops working, a lift tube cracks, and you don't have any spares. Meanwhile, you little or no filtration or circulation until you can get the part you need. At Aquarium Pumps and More, we suggest that when you order a pump or filter, order some spare parts, filter cartridges and/or filter media as well. They're inexpensive, and you'll never know when you'll need them. When you do (and you WILL), you'll be glad you have the right part to fix the problem without stressing you or your fish.