Injection ports are disclosed for use with a gastric band for the treatment of obesity. An injection port may include a septum having a top surface, a bottom surface, and a side wall connecting the top surface to the bottom surface. The injection port may also include a housing including a first inner side wall being tapered inwards such that an opening defined at a first end is larger than an opening defined at a second end, the tapering of the first inner side wall being used to secure the septum within the housing. The housing may further include a second inner side wall having a first end and a second end, the first end of the second inner side wall joined to the second end of the first inner side wall, and a bottom surface joined to the second end of the second inner side wall.