You are purchasing a SC-25 Buss or Cooper Bussman Fuse that is 1 5/8" Long X 3/8" wide found on many Balboa , Gecko, Hydroquip , ACC, Nuwave , Len Gordon , Spa Builders and more Brand Spa Hot Tub Boards and control packs. This Fuse can also be found under the Littlefuse brand and part number SLC-25. They are We have plenty of these. Buy with caution I Do Not Accept returns! This fuse is found in many different board and control system applications on hot tubs. Note: If your fuse is blowing and you don't solve the issue that causes it to blow installing another fuse will not solve anything. If you fuse is blowing fast it is a dead short of some kind if it blows slow it is a loose connection of some kind.