Abstract: A sub-assembly is disclosed. The sub-assembly includes an endcap connected to a seal member. The endcap includes a body, an outer circumferential lip connected to a first end of the body, and an inner circumferential lip body connected to a second end of the body. The inner circumferential lip body defines a groove. The inner circumferential lip body extends away from and beyond a top surface of the body and a lower portion extending away from and beyond a bottom surface of the body of the endcap. The seal member includes a body, and a circumferential lip connected to the body of the seal member. The body of the seal member includes a top surface and a bottom surface. The top surface of the body of the seal member includes a recess. The inner circumferential lip body of the endcap is arranged within the recess of the seal member. A portion of a filter assembly is also disclosed. A method for manufacturing at least a sub-assembly of a filter assembly is also disclosed.